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        <Amt>1216543</Amt>
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      <OtherLiabilitiesOrgGrp>
        <Desc>DERIVATIVE LIABILITY</Desc>
        <Amt>4720813</Amt>
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      <OtherLiabilitiesOrgGrp>
        <Desc>OTHER LIABILITIES</Desc>
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      <FootnoteTextInd>X</FootnoteTextInd>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>USE OF ENDOWMENT FUNDS</FormAndLineReferenceDesc>
        <ExplanationTxt>FORM 990, SCHEDULE D, PART V, LINE 4 EARNINGS FROM THE ENDOWMENT ARE USED TO FURTHER THE EXEMPT PURPOSES OF THE ORGANIZATION.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>LIABILITY FOR UNCERTAIN TAX POSITION</FormAndLineReferenceDesc>
        <ExplanationTxt>FORM 990, SCHEDULE D, PART X, LINE 2 NAS follows guidance that clarifies the accounting for uncertainty in tax positions taken or expected to be taken in a tax return, including issues relating to financial statement recognition and measurement. This guidance provides that the tax effects from an uncertain tax position can only be recognized in the financial statements if the position is "more-likely-than-not" to be sustained if the position were to be challenged by a taxing authority. The assessment of the tax position is based solely on the technical merits of the position, without regard to the likelihood that the tax position may be challenged. NAS is exempt from federal income tax under Internal Revenue Code ("IRC") Section 501(c)(3), though it is subject to tax on income unrelated to its exempt purpose, unless that income is otherwise excluded by the IRC. NAS has processes presently in place to maintain its tax-exempt status; to identify and report unrelated income; to determine its filing and tax obligations in jurisdictions for which it may have a nexus; and to identify and evaluate other matters that may be considered tax positions. The tax years ending December 31, 2019, 2018, 2017, and 2016 are still open to audit for both federal and state income tax purposes. NAS has determined that there are no material unrelated business activities or uncertain tax positions that require recognition or disclosure in the financial statements. RECONCILIATION OF REVENUE PER AFS WITH REVENUE PER RETURN FORM 990 SCHEDULE D, PART XI, LINE 2D AMOUNT REPORTED INCLUDES: COST OF GOODS SOLD $14,216,902 UNREALIZED loss ON DERIVATIVES (70,664) RENTAL EXPENSE 1,013,546 UNREALIZED gain ON CHARITABLE GIFT ANNUITIES 180,467 INVESTMENT RELATED EXPENSES (48,329) ------------ TOTAL $15,291,922 ============</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>RECONCILIATION OF EXPENSE PER AFS WITH EXPENSE PER RETURN</FormAndLineReferenceDesc>
        <ExplanationTxt>FORM 990, SCHEDULE D, PART XII, LINE 4B AMOUNT REPORTED INCLUDES: COST OF GOODS SOLD (14,216,902) RENTAL EXPENSE (1,013,546) INVESTMENT RELATED EXPENSES 48,329 ------------ TOTAL $(15,182,119) ============</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleD>
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      <GrantsToOrgOutsideUSGrp>
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      <GrantsToOrgOutsideUSGrp>
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      <GrantsToOrgOutsideUSGrp>
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      <GrantsToOrgOutsideUSGrp>
        <RegionTxt>East Asia and the Pacific</RegionTxt>
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      <GrantsToOrgOutsideUSGrp>
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      <GrantsToOrgOutsideUSGrp>
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      <GrantsToOrgOutsideUSGrp>
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      <GrantsToOrgOutsideUSGrp>
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      <GrantsToOrgOutsideUSGrp>
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      <GrantsToOrgOutsideUSGrp>
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      <GrantsToOrgOutsideUSGrp>
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      <GrantsToOrgOutsideUSGrp>
        <RegionTxt>East Asia and the Pacific</RegionTxt>
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      <GrantsToOrgOutsideUSGrp>
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      </GrantsToOrgOutsideUSGrp>
      <Total501c3OrgCnt>10</Total501c3OrgCnt>
      <TotalOtherOrgCnt>83</TotalOtherOrgCnt>
      <ForeignIndividualsGrantsGrp>
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        <RecipientCnt>2</RecipientCnt>
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        <MannerOfCashDisbursementTxt>wire</MannerOfCashDisbursementTxt>
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      <ForeignIndividualsGrantsGrp>
        <TypeOfAssistanceTxt>Individual Fellowship</TypeOfAssistanceTxt>
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        <MannerOfCashDisbursementTxt>Wire</MannerOfCashDisbursementTxt>
      </ForeignIndividualsGrantsGrp>
      <ForeignIndividualsGrantsGrp>
        <TypeOfAssistanceTxt>Individual Fellowship</TypeOfAssistanceTxt>
        <RegionTxt>Middle East and North Africa</RegionTxt>
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      </ForeignIndividualsGrantsGrp>
      <ForeignIndividualsGrantsGrp>
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        <MannerOfCashDisbursementTxt>Wire</MannerOfCashDisbursementTxt>
      </ForeignIndividualsGrantsGrp>
      <ForeignIndividualsGrantsGrp>
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      <ForeignIndividualsGrantsGrp>
        <TypeOfAssistanceTxt>Individual Speaker Fees &amp; Honoraria</TypeOfAssistanceTxt>
        <RegionTxt>Sub-Saharan Africa</RegionTxt>
        <RecipientCnt>8</RecipientCnt>
        <CashGrantAmt>8000</CashGrantAmt>
        <MannerOfCashDisbursementTxt>Wire</MannerOfCashDisbursementTxt>
      </ForeignIndividualsGrantsGrp>
      <TransferToForeignCorpInd>true</TransferToForeignCorpInd>
      <InterestInForeignTrustInd>false</InterestInForeignTrustInd>
      <ForeignCorpOwnershipInd>true</ForeignCorpOwnershipInd>
      <PassiveForeignInvestmestCoInd>true</PassiveForeignInvestmestCoInd>
      <ForeignPartnershipInd>true</ForeignPartnershipInd>
      <BoycottCountriesInd>false</BoycottCountriesInd>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>MONITORING THE USE OF GRANTS AND OTHER ASSISTANCE</FormAndLineReferenceDesc>
        <ExplanationTxt>SCHEDULE F, PART 1, LINE 2 NAS PROGRAMMATIC STAFF REVIEW GRANT PROPOSALS AND BUDGETS SUBMITTED BY RECIPIENT ORGANIZATIONS PRIOR TO AWARDING THE GRANT FUNDS. NAS POLICY IS TO COMPLY WITH RESTRICTIONS ON GRANT AWARDS TO COUNTRIES ON THE U.S. GOVERNMENT'S CURRENT LIST OF SANCTIONED COUNTRIES. RECIPIENTS ARE GENERALLY EXPECTED TO SUBMIT PROGRESS REPORTS DURING THE GRANT PERIOD.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>ACCOUNTING METHOD USED</FormAndLineReferenceDesc>
        <ExplanationTxt>SCHEDULE F, PART I, LINE 3, COLUMN (F) THE EXPENDITURES, PER REGION, ARE PRESENTED ON THE ACCRUAL BASIS OF ACCOUNTING.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleF>
    <IRS990ScheduleG documentId="IRS990ScheduleG">
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      <EmailSolicitationsInd>X</EmailSolicitationsInd>
      <InPersonSolicitationsInd>X</InPersonSolicitationsInd>
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      <SolicitationOfGovtGrantsInd>X</SolicitationOfGovtGrantsInd>
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        <PersonNm>Marts and Lundy Inc</PersonNm>
        <USAddress>
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          <StateAbbreviationCd>NJ</StateAbbreviationCd>
          <ZIPCd>07071</ZIPCd>
        </USAddress>
        <ActivityTxt>Fundraising Counsel</ActivityTxt>
        <FundraiserControlOfFundsInd>false</FundraiserControlOfFundsInd>
        <RetainedByContractorAmt>117705</RetainedByContractorAmt>
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      <TotalRetainedByContractorsAmt>117705</TotalRetainedByContractorsAmt>
      <LicensedStatesCd>AL</LicensedStatesCd>
      <LicensedStatesCd>AK</LicensedStatesCd>
      <LicensedStatesCd>AZ</LicensedStatesCd>
      <LicensedStatesCd>AR</LicensedStatesCd>
      <LicensedStatesCd>CO</LicensedStatesCd>
      <LicensedStatesCd>CT</LicensedStatesCd>
      <LicensedStatesCd>DC</LicensedStatesCd>
      <LicensedStatesCd>FL</LicensedStatesCd>
      <LicensedStatesCd>GA</LicensedStatesCd>
      <LicensedStatesCd>HI</LicensedStatesCd>
      <LicensedStatesCd>KY</LicensedStatesCd>
      <LicensedStatesCd>ME</LicensedStatesCd>
      <LicensedStatesCd>MD</LicensedStatesCd>
      <LicensedStatesCd>MA</LicensedStatesCd>
      <LicensedStatesCd>MI</LicensedStatesCd>
      <LicensedStatesCd>MN</LicensedStatesCd>
      <LicensedStatesCd>MS</LicensedStatesCd>
      <LicensedStatesCd>NH</LicensedStatesCd>
      <LicensedStatesCd>NJ</LicensedStatesCd>
      <LicensedStatesCd>NM</LicensedStatesCd>
      <LicensedStatesCd>NY</LicensedStatesCd>
      <LicensedStatesCd>ND</LicensedStatesCd>
      <LicensedStatesCd>OH</LicensedStatesCd>
      <LicensedStatesCd>OK</LicensedStatesCd>
      <LicensedStatesCd>PA</LicensedStatesCd>
      <LicensedStatesCd>RI</LicensedStatesCd>
      <LicensedStatesCd>TN</LicensedStatesCd>
      <LicensedStatesCd>UT</LicensedStatesCd>
      <LicensedStatesCd>VA</LicensedStatesCd>
      <LicensedStatesCd>WA</LicensedStatesCd>
      <LicensedStatesCd>WV</LicensedStatesCd>
      <LicensedStatesCd>WI</LicensedStatesCd>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>SCHEDULE G FILING</FormAndLineReferenceDesc>
        <ExplanationTxt>THE NATIONAL ACADEMY OF SCIENCES FILES SCHEDULE G DUE TO THE ENGAGEMENT OF A PROFESSIONAL FUNDRAISING COUNSEL, WHOSE ROLE IS LIMITED TO PROSPECT MANAGEMENT AND DOES NOT INVOLVE SOLICITING FUNDS.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleG>
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          <CityNm>WASHINGTON</CityNm>
          <StateAbbreviationCd>DC</StateAbbreviationCd>
          <ZIPCd>20024</ZIPCd>
        </USAddress>
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      <RecipientTable>
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      <RecipientTable>
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        <USAddress>
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          <CityNm>WOODS HOLE</CityNm>
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        <RecipientEIN>042105850</RecipientEIN>
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        <IRCSectionDesc>GOVT</IRCSectionDesc>
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      <RecipientTable>
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      <RecipientTable>
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        <DeferredCompensationFlngOrgAmt>18527</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>42824</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>422233</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>DAVID MAY</PersonNm>
        <TitleTxt>CHIEF COMMUNICATIONS OFFICER</TitleTxt>
        <BaseCompensationFilingOrgAmt>286060</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>30000</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>21980</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>25797</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>37064</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>400901</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>JOHN ANDERSON</PersonNm>
        <TitleTxt>PRESIDENT- NAE BEG 7/01/19</TitleTxt>
        <BaseCompensationFilingOrgAmt>352886</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>82609</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>0</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>9145</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>444640</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>HOUSING ALLOWANCE</FormAndLineReferenceDesc>
        <ExplanationTxt>SCHEDULE J, PART I, LINE 1 THE PRESIDENT OF THE NATIONAL ACADEMY OF SCIENCES, THE NATIONAL ACADEMY OF MEDICINE, AND THE NATIONAL ACADEMY OF ENGINEERING EACH RECEIVED A SUPPLEMENT TO SALARY FOR THE COST OF RENTAL HOUSING IN THE WASHINGTON, DC AREA FOR PERSONAL USE AND TRAVEL EXPENSES. THE ALLOWANCE IS REPORTED AS TAXABLE INCOME ON FORM W-2.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>TRAVEL FOR COMPANIONS</FormAndLineReferenceDesc>
        <ExplanationTxt>SCHEDULE J, PART I, LINE 1 NAS PROCEDURES PROVIDE FOR REIMBURSEMENT OF TRAVEL EXPENSES FOR THE SPOUSES OF THE PRESIDENTS OF NAS, NAE, AND NAM SOLELY IN CIRCUMSTANCES IN WHICH THE SPOUSES PRESENCE SERVES A BONA FIDE BUSINESS PURPOSE OF THE NAS AND THE EXPENSES HAVE BEEN PROPERLY SUBSTANTIATED. TRAVEL EXPENSES ARE REVIEWED EACH YEAR THROUGH A SURVEY OF THE EXECUTIVE OFFICES OF THE PRESIDENTS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>TAX INDEMNIFICATION AND GROSS-UP PAYMENTS</FormAndLineReferenceDesc>
        <ExplanationTxt>SCHEDULE J, PART I, LINE 1 NAS PROVIDES TAX EQUALIZATION PAYMENTS FOR EMPLOYEES ON INTERNATIONAL ASSIGNMENT IN JAPAN GREATER THAN SIX MONTHS. THE OBJECTIVE OF THE NAS TAX EQUALIZATION GUIDELINES IS TO EQUALIZE THE TAX BURDEN OF EMPLOYEES ASSIGNED TO JAPAN. SCHEDULE J, PART-TIME OFFICERS' COMPENSATION FOR THE VICE PRESIDENT, TREASURER, FOREIGN SECRETARY AND HOME SECRETARY, TIME ESTIMATES ARE BASED ON A PERCENTAGE LEVEL OF EFFORT, WHICH RANGES BETWEEN 25% AND 50%. NAS REIMBURSES EACH PART-TIME OFFICER'S HOME INSTITUTION FOR THE APPLICABLE PERCENTAGE OF SALARY PAID BY THE HOME INSTITUTION.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>NON-FIXED PAYMENTS</FormAndLineReferenceDesc>
        <ExplanationTxt>SCHEDULE J, PART I, LINE 7 CERTAIN OFFICERS, KEY, AND OTHER EMPLOYEES OF NAS RECEIVED LUMP-SUM MERIT AWARDS. MERIT AWARDS ARE DETERMINED BY A NUMBER OF VARIABLES INCLUDING BUT NOT LIMITED TO INDIVIDUAL PERFORMANCE AS WELL AS ORGANIZATION OPERATIONAL ACHIEVEMENTS. MERIT AWARDS PAYMENTS ARE REPORTED IN PART II, COLUMN B(II).</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleJ>
    <IRS990ScheduleK documentId="IRS990ScheduleK">
      <TaxExemptBondsIssuesGrp>
        <BondReferenceCd>A</BondReferenceCd>
        <IssuerName>
          <BusinessNameLine1Txt>District of Columbia</BusinessNameLine1Txt>
        </IssuerName>
        <BondIssuerEIN>536001131</BondIssuerEIN>
        <CUSIPNum>000000000</CUSIPNum>
        <BondIssuedDt>2019-08-01</BondIssuedDt>
        <IssuePriceAmt>57100000</IssuePriceAmt>
        <PurposeDesc>REFUND SERIES 2008A BONDS</PurposeDesc>
        <DefeasedInd>false</DefeasedInd>
        <OnBehalfOfIssuerInd>false</OnBehalfOfIssuerInd>
        <PoolFinancingInd>false</PoolFinancingInd>
      </TaxExemptBondsIssuesGrp>
      <TaxExemptBondsIssuesGrp>
        <BondReferenceCd>B</BondReferenceCd>
        <IssuerName>
          <BusinessNameLine1Txt>District of Columbia</BusinessNameLine1Txt>
        </IssuerName>
        <BondIssuerEIN>536001131</BondIssuerEIN>
        <CUSIPNum>000000000</CUSIPNum>
        <BondIssuedDt>2017-05-01</BondIssuedDt>
        <IssuePriceAmt>46770000</IssuePriceAmt>
        <PurposeDesc>REFUND SERIES 2009A BONDS</PurposeDesc>
        <DefeasedInd>false</DefeasedInd>
        <OnBehalfOfIssuerInd>false</OnBehalfOfIssuerInd>
        <PoolFinancingInd>false</PoolFinancingInd>
      </TaxExemptBondsIssuesGrp>
      <TaxExemptBondsIssuesGrp>
        <BondReferenceCd>C</BondReferenceCd>
        <IssuerName>
          <BusinessNameLine1Txt>District of Columbia</BusinessNameLine1Txt>
        </IssuerName>
        <BondIssuerEIN>536001131</BondIssuerEIN>
        <CUSIPNum>2548398N6</CUSIPNum>
        <BondIssuedDt>2010-05-20</BondIssuedDt>
        <IssuePriceAmt>60876507</IssuePriceAmt>
        <PurposeDesc>RESTORE CONSTITUTION AVE FACILITY</PurposeDesc>
        <DefeasedInd>false</DefeasedInd>
        <OnBehalfOfIssuerInd>false</OnBehalfOfIssuerInd>
        <PoolFinancingInd>false</PoolFinancingInd>
      </TaxExemptBondsIssuesGrp>
      <TaxExemptBondsIssuesGrp>
        <BondReferenceCd>D</BondReferenceCd>
        <IssuerName>
          <BusinessNameLine1Txt>District of Columbia</BusinessNameLine1Txt>
        </IssuerName>
        <BondIssuerEIN>536001131</BondIssuerEIN>
        <CUSIPNum>000000000</CUSIPNum>
        <BondIssuedDt>2017-12-21</BondIssuedDt>
        <IssuePriceAmt>52760000</IssuePriceAmt>
        <PurposeDesc>PARTIAL REFUND SERIES 2010A BONDS</PurposeDesc>
        <DefeasedInd>false</DefeasedInd>
        <OnBehalfOfIssuerInd>false</OnBehalfOfIssuerInd>
        <PoolFinancingInd>false</PoolFinancingInd>
      </TaxExemptBondsIssuesGrp>
      <TaxExemptBondsProceedsGrp>
        <BondReferenceCd>A</BondReferenceCd>
        <RetiredAmt>0</RetiredAmt>
        <BondDefeasedAmt>0</BondDefeasedAmt>
        <TotalProceedsAmt>66325000</TotalProceedsAmt>
        <InReserveFundAmt>0</InReserveFundAmt>
        <CapitalizedInterestAmt>0</CapitalizedInterestAmt>
        <RefundingEscrowAmt>0</RefundingEscrowAmt>
        <IssuanceCostsFromProceedsAmt>0</IssuanceCostsFromProceedsAmt>
        <CreditEnhancementAmt>0</CreditEnhancementAmt>
        <WorkingCapitalExpendituresAmt>0</WorkingCapitalExpendituresAmt>
        <CapitalExpendituresAmt>0</CapitalExpendituresAmt>
        <OtherSpentProceedsAmt>0</OtherSpentProceedsAmt>
        <UnspentAmt>0</UnspentAmt>
        <SubstantialCompletionYr>2002</SubstantialCompletionYr>
        <RefundingTaxExemptBondsInd>true</RefundingTaxExemptBondsInd>
        <RefundingTaxableBondsInd>false</RefundingTaxableBondsInd>
        <FinalAllocationMadeInd>true</FinalAllocationMadeInd>
        <AdequateBooksAndRecMaintInd>true</AdequateBooksAndRecMaintInd>
      </TaxExemptBondsProceedsGrp>
      <TaxExemptBondsProceedsGrp>
        <BondReferenceCd>B</BondReferenceCd>
        <RetiredAmt>0</RetiredAmt>
        <BondDefeasedAmt>0</BondDefeasedAmt>
        <TotalProceedsAmt>52120000</TotalProceedsAmt>
        <InReserveFundAmt>0</InReserveFundAmt>
        <CapitalizedInterestAmt>0</CapitalizedInterestAmt>
        <RefundingEscrowAmt>0</RefundingEscrowAmt>
        <IssuanceCostsFromProceedsAmt>0</IssuanceCostsFromProceedsAmt>
        <CreditEnhancementAmt>0</CreditEnhancementAmt>
        <WorkingCapitalExpendituresAmt>0</WorkingCapitalExpendituresAmt>
        <CapitalExpendituresAmt>0</CapitalExpendituresAmt>
        <OtherSpentProceedsAmt>0</OtherSpentProceedsAmt>
        <UnspentAmt>0</UnspentAmt>
        <SubstantialCompletionYr>2002</SubstantialCompletionYr>
        <RefundingTaxExemptBondsInd>true</RefundingTaxExemptBondsInd>
        <RefundingTaxableBondsInd>false</RefundingTaxableBondsInd>
        <FinalAllocationMadeInd>true</FinalAllocationMadeInd>
        <AdequateBooksAndRecMaintInd>true</AdequateBooksAndRecMaintInd>
      </TaxExemptBondsProceedsGrp>
      <TaxExemptBondsProceedsGrp>
        <BondReferenceCd>C</BondReferenceCd>
        <RetiredAmt>0</RetiredAmt>
        <BondDefeasedAmt>49125000</BondDefeasedAmt>
        <TotalProceedsAmt>60876507</TotalProceedsAmt>
        <InReserveFundAmt>0</InReserveFundAmt>
        <CapitalizedInterestAmt>5285950</CapitalizedInterestAmt>
        <RefundingEscrowAmt>0</RefundingEscrowAmt>
        <IssuanceCostsFromProceedsAmt>0</IssuanceCostsFromProceedsAmt>
        <CreditEnhancementAmt>0</CreditEnhancementAmt>
        <WorkingCapitalExpendituresAmt>0</WorkingCapitalExpendituresAmt>
        <CapitalExpendituresAmt>50408099</CapitalExpendituresAmt>
        <OtherSpentProceedsAmt>10468408</OtherSpentProceedsAmt>
        <UnspentAmt>0</UnspentAmt>
        <SubstantialCompletionYr>2012</SubstantialCompletionYr>
        <RefundingTaxExemptBondsInd>false</RefundingTaxExemptBondsInd>
        <RefundingTaxableBondsInd>false</RefundingTaxableBondsInd>
        <FinalAllocationMadeInd>true</FinalAllocationMadeInd>
        <AdequateBooksAndRecMaintInd>true</AdequateBooksAndRecMaintInd>
      </TaxExemptBondsProceedsGrp>
      <TaxExemptBondsProceedsGrp>
        <BondReferenceCd>D</BondReferenceCd>
        <RetiredAmt>0</RetiredAmt>
        <BondDefeasedAmt>0</BondDefeasedAmt>
        <TotalProceedsAmt>52760000</TotalProceedsAmt>
        <InReserveFundAmt>0</InReserveFundAmt>
        <CapitalizedInterestAmt>0</CapitalizedInterestAmt>
        <RefundingEscrowAmt>52756156</RefundingEscrowAmt>
        <IssuanceCostsFromProceedsAmt>0</IssuanceCostsFromProceedsAmt>
        <CreditEnhancementAmt>0</CreditEnhancementAmt>
        <WorkingCapitalExpendituresAmt>0</WorkingCapitalExpendituresAmt>
        <CapitalExpendituresAmt>0</CapitalExpendituresAmt>
        <OtherSpentProceedsAmt>844</OtherSpentProceedsAmt>
        <UnspentAmt>0</UnspentAmt>
        <SubstantialCompletionYr>2012</SubstantialCompletionYr>
        <RefundingTaxExemptBondsInd>false</RefundingTaxExemptBondsInd>
        <RefundingTaxableBondsInd>true</RefundingTaxableBondsInd>
        <FinalAllocationMadeInd>true</FinalAllocationMadeInd>
        <AdequateBooksAndRecMaintInd>true</AdequateBooksAndRecMaintInd>
      </TaxExemptBondsProceedsGrp>
      <TaxExemptBondsPrivateBusUseGrp>
        <BondReferenceCd>A</BondReferenceCd>
        <PrivateBusUseByOthersPct>0</PrivateBusUseByOthersPct>
      </TaxExemptBondsPrivateBusUseGrp>
      <TaxExemptBondsPrivateBusUseGrp>
        <BondReferenceCd>B</BondReferenceCd>
        <PrivateBusUseByOthersPct>0</PrivateBusUseByOthersPct>
      </TaxExemptBondsPrivateBusUseGrp>
      <TaxExemptBondsPrivateBusUseGrp>
        <BondReferenceCd>C</BondReferenceCd>
        <OwningBondFinancedPropertyInd>false</OwningBondFinancedPropertyInd>
        <AnyLeaseArrangementsInd>false</AnyLeaseArrangementsInd>
        <MgmtContractBondFincdPropInd>true</MgmtContractBondFincdPropInd>
        <EngageBondCounselContractsInd>true</EngageBondCounselContractsInd>
        <AnyResearchAgreementsInd>true</AnyResearchAgreementsInd>
        <EngageBondCounselResearchInd>true</EngageBondCounselResearchInd>
        <PrivateBusUseByOthersPct>0.00534</PrivateBusUseByOthersPct>
        <PrivateBusConcerningUBIPct>0.00005</PrivateBusConcerningUBIPct>
        <TotalPrivateBusinessUsePct>0.00529</TotalPrivateBusinessUsePct>
        <BondIssMeetPrvtSecPymtTestInd>false</BondIssMeetPrvtSecPymtTestInd>
        <ChangeInUseBondFinancedPropInd>false</ChangeInUseBondFinancedPropInd>
        <RemedialActionTakenInd>false</RemedialActionTakenInd>
        <ProcsNonqualifiedBondRemdtdInd>true</ProcsNonqualifiedBondRemdtdInd>
      </TaxExemptBondsPrivateBusUseGrp>
      <TaxExemptBondsPrivateBusUseGrp>
        <BondReferenceCd>D</BondReferenceCd>
        <OwningBondFinancedPropertyInd>false</OwningBondFinancedPropertyInd>
        <AnyLeaseArrangementsInd>false</AnyLeaseArrangementsInd>
        <MgmtContractBondFincdPropInd>true</MgmtContractBondFincdPropInd>
        <EngageBondCounselContractsInd>true</EngageBondCounselContractsInd>
        <AnyResearchAgreementsInd>true</AnyResearchAgreementsInd>
        <EngageBondCounselResearchInd>true</EngageBondCounselResearchInd>
        <PrivateBusUseByOthersPct>0.00534</PrivateBusUseByOthersPct>
        <PrivateBusConcerningUBIPct>0.00005</PrivateBusConcerningUBIPct>
        <TotalPrivateBusinessUsePct>0.00529</TotalPrivateBusinessUsePct>
        <BondIssMeetPrvtSecPymtTestInd>false</BondIssMeetPrvtSecPymtTestInd>
        <ChangeInUseBondFinancedPropInd>false</ChangeInUseBondFinancedPropInd>
        <RemedialActionTakenInd>false</RemedialActionTakenInd>
        <ProcsNonqualifiedBondRemdtdInd>true</ProcsNonqualifiedBondRemdtdInd>
      </TaxExemptBondsPrivateBusUseGrp>
      <TaxExemptBondsArbitrageGrp>
        <BondReferenceCd>A</BondReferenceCd>
        <Form8038TFiledInd>false</Form8038TFiledInd>
        <ExceptionToRebateInd>true</ExceptionToRebateInd>
        <VariableRateIssueInd>true</VariableRateIssueInd>
        <HedgeIdentifiedInBksAndRecInd>false</HedgeIdentifiedInBksAndRecInd>
        <HedgeProviderName>
          <BusinessNameLine1Txt>0</BusinessNameLine1Txt>
        </HedgeProviderName>
        <GrossProceedsInvestedInGICInd>false</GrossProceedsInvestedInGICInd>
        <GICProviderName>
          <BusinessNameLine1Txt>0</BusinessNameLine1Txt>
        </GICProviderName>
        <GrossProceedsInvestedInd>false</GrossProceedsInvestedInd>
        <WrittenProcToMonitorReqsInd>true</WrittenProcToMonitorReqsInd>
      </TaxExemptBondsArbitrageGrp>
      <TaxExemptBondsArbitrageGrp>
        <BondReferenceCd>B</BondReferenceCd>
        <Form8038TFiledInd>false</Form8038TFiledInd>
        <ExceptionToRebateInd>true</ExceptionToRebateInd>
        <VariableRateIssueInd>true</VariableRateIssueInd>
        <HedgeIdentifiedInBksAndRecInd>false</HedgeIdentifiedInBksAndRecInd>
        <HedgeProviderName>
          <BusinessNameLine1Txt>0</BusinessNameLine1Txt>
        </HedgeProviderName>
        <GrossProceedsInvestedInGICInd>false</GrossProceedsInvestedInGICInd>
        <GICProviderName>
          <BusinessNameLine1Txt>0</BusinessNameLine1Txt>
        </GICProviderName>
        <GrossProceedsInvestedInd>false</GrossProceedsInvestedInd>
        <WrittenProcToMonitorReqsInd>true</WrittenProcToMonitorReqsInd>
      </TaxExemptBondsArbitrageGrp>
      <TaxExemptBondsArbitrageGrp>
        <BondReferenceCd>C</BondReferenceCd>
        <Form8038TFiledInd>false</Form8038TFiledInd>
        <RebateNotDueYetInd>true</RebateNotDueYetInd>
        <VariableRateIssueInd>false</VariableRateIssueInd>
        <HedgeIdentifiedInBksAndRecInd>false</HedgeIdentifiedInBksAndRecInd>
        <HedgeProviderName>
          <BusinessNameLine1Txt>0</BusinessNameLine1Txt>
        </HedgeProviderName>
        <GrossProceedsInvestedInGICInd>false</GrossProceedsInvestedInGICInd>
        <GICProviderName>
          <BusinessNameLine1Txt>0</BusinessNameLine1Txt>
        </GICProviderName>
        <GrossProceedsInvestedInd>false</GrossProceedsInvestedInd>
        <WrittenProcToMonitorReqsInd>true</WrittenProcToMonitorReqsInd>
      </TaxExemptBondsArbitrageGrp>
      <TaxExemptBondsArbitrageGrp>
        <BondReferenceCd>D</BondReferenceCd>
        <Form8038TFiledInd>false</Form8038TFiledInd>
        <RebateNotDueYetInd>true</RebateNotDueYetInd>
        <VariableRateIssueInd>false</VariableRateIssueInd>
        <HedgeIdentifiedInBksAndRecInd>false</HedgeIdentifiedInBksAndRecInd>
        <HedgeProviderName>
          <BusinessNameLine1Txt>0</BusinessNameLine1Txt>
        </HedgeProviderName>
        <GrossProceedsInvestedInGICInd>false</GrossProceedsInvestedInGICInd>
        <GICProviderName>
          <BusinessNameLine1Txt>0</BusinessNameLine1Txt>
        </GICProviderName>
        <GrossProceedsInvestedInd>false</GrossProceedsInvestedInd>
        <WrittenProcToMonitorReqsInd>true</WrittenProcToMonitorReqsInd>
      </TaxExemptBondsArbitrageGrp>
      <ProceduresCorrectiveActionGrp>
        <BondReferenceCd>A</BondReferenceCd>
        <ProceduresCorrectiveActionInd>true</ProceduresCorrectiveActionInd>
      </ProceduresCorrectiveActionGrp>
      <ProceduresCorrectiveActionGrp>
        <BondReferenceCd>B</BondReferenceCd>
        <ProceduresCorrectiveActionInd>true</ProceduresCorrectiveActionInd>
      </ProceduresCorrectiveActionGrp>
      <ProceduresCorrectiveActionGrp>
        <BondReferenceCd>C</BondReferenceCd>
        <ProceduresCorrectiveActionInd>true</ProceduresCorrectiveActionInd>
      </ProceduresCorrectiveActionGrp>
      <ProceduresCorrectiveActionGrp>
        <BondReferenceCd>D</BondReferenceCd>
        <ProceduresCorrectiveActionInd>true</ProceduresCorrectiveActionInd>
      </ProceduresCorrectiveActionGrp>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>SCHEDULE K, PART II, LINE 3, COLUMNS A AND B</FormAndLineReferenceDesc>
        <ExplanationTxt>Part II, Line 3 amount reflects the total proceeds from the original bond issues, while the issue price in Part I reflects the reissued amount per the Form 8038.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>SCHEDULE K, PART III, LINE 3A, COLUMNS C AND D</FormAndLineReferenceDesc>
        <ExplanationTxt>NAS HAS ENTERED INTO A MANAGEMENT OR SERVICE CONTRACT, WHICH NAS BELIEVES SATISFIES THE SAFE HARBOR STANDARDS UNDER REV. PROC. 97-13.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>SCHEDULE K, PART III, LINE 3C, COLUMNS C AND D</FormAndLineReferenceDesc>
        <ExplanationTxt>THE NAS HAS ENTERED INTO RESEARCH AGREEMENTS, WHICH NAS BELIEVES SATISFIES THE SAFE HARBOR STANDARDS UNDER REV. PROC. 2007-47.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>SCHEDULE K, PART IV, LINE 2B, COLUMN A</FormAndLineReferenceDesc>
        <ExplanationTxt>THE REBATE COMPUTATION WAS PERFORMED ON DECEMBER 3, 2012.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>SCHEDULE K, PART IV, LINE 2B, COLUMN B</FormAndLineReferenceDesc>
        <ExplanationTxt>THE REBATE COMPUTATION WAS PERFORMED ON DECEMBER 3, 2012.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>SCHEDULE K, PART IV, LINE 2A, COLUMN C</FormAndLineReferenceDesc>
        <ExplanationTxt>THE REBATE COMPUTATION WAS PERFORMED ON MAY 1, 2019. AN ADDITIONAL REBATE COMPUTATION WAS PERFORMED ON MAY 1, 2020.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleK>
    <IRS990ScheduleL documentId="IRS990ScheduleL">
      <LoansBtwnOrgInterestedPrsnGrp>
        <PersonNm>C Dan Mote Jr</PersonNm>
        <RelationshipWithOrgTxt>President - NAE</RelationshipWithOrgTxt>
        <LoanPurposeTxt>PURCHASE RESIDENCE</LoanPurposeTxt>
        <LoanFromOrganizationInd>X</LoanFromOrganizationInd>
        <OriginalPrincipalAmt>1500000</OriginalPrincipalAmt>
        <BalanceDueAmt>866063</BalanceDueAmt>
        <DefaultInd>false</DefaultInd>
        <BoardOrCommitteeApprovalInd>true</BoardOrCommitteeApprovalInd>
        <WrittenAgreementInd>true</WrittenAgreementInd>
      </LoansBtwnOrgInterestedPrsnGrp>
      <TotalBalanceDueAmt>866063</TotalBalanceDueAmt>
    </IRS990ScheduleL>
    <IRS990ScheduleM documentId="IRS990ScheduleM">
      <WorksOfArtGrp />
      <ArtHistoricalTreasuresGrp />
      <ArtFractionalInterestGrp />
      <BooksAndPublicationsGrp />
      <ClothingAndHouseholdGoodsGrp />
      <CarsAndOtherVehiclesGrp />
      <BoatsAndPlanesGrp />
      <IntellectualPropertyGrp />
      <SecuritiesPubliclyTradedGrp>
        <NonCashCheckboxInd>X</NonCashCheckboxInd>
        <ContributionCnt>15</ContributionCnt>
        <NoncashContributionsRptF990Amt>2686017</NoncashContributionsRptF990Amt>
        <MethodOfDeterminingRevenuesTxt>Sale Price</MethodOfDeterminingRevenuesTxt>
      </SecuritiesPubliclyTradedGrp>
      <SecuritiesCloselyHeldStockGrp />
      <SecurPrtnrshpTrustIntrstsGrp />
      <SecuritiesMiscellaneousGrp />
      <QualifiedContribHistStructGrp />
      <QualifiedContribOtherGrp />
      <RealEstateResidentialGrp />
      <RealEstateCommercialGrp />
      <RealEstateOtherGrp />
      <CollectiblesGrp />
      <FoodInventoryGrp />
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        <FormAndLineReferenceDesc>NUMBER OF CONTRIBUTIONS</FormAndLineReferenceDesc>
        <ExplanationTxt>SCHEDULE M, PART I, COLUMN (B) THE ORGANIZATION IS REPORTING THE NUMBER OF CONTRIBUTIONS IN COLUMN (B)</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART-TIME OFFICERS' COMPENSATION</FormAndLineReferenceDesc>
        <ExplanationTxt>FORM 990, PART VI, LINE 1B FOR THE VICE PRESIDENT, TREASURER, FOREIGN SECRETARY AND HOME SECRETARY, TIME ESTIMATES ARE BASED ON A PERCENTAGE LEVEL OF EFFORT, WHICH RANGES BETWEEN 25% AND 50%. NAS REIMBURSES EACH PART-TIME OFFICER'S HOME INSTITUTION FOR THE APPLICABLE PERCENTAGE OF SALARY PAID BY THE HOME INSTITUTION. SIGNIFICANT CHANGES TO GOVERNING DOCUMENTS FORM 990, PART VI, LINE 4 The NAS Constitution was amended to change the name of the "Finance Committee" to the "Investment Committee." The amendment also included a change in the composition of the committee. The NAS Bylaws were amended to make the changes corresponding to the changes made in the Constitution and to change the responsibilities of the Treasurer relating to investments. The Bylaws were also amended to permit rescinding membership in the Academy for a violation of the NAS Code of Conduct and to modernize archaic language, change outdated procedures to conform with current practice, and remove gender-specific terms. MEMBERS OR STOCKHOLDERS FORM 990, PART VI, SECTION A, LINES 6, 7A, AND 7B THE ORGANIZATION IS A PRIVATE MEMBERSHIP ORGANIZATION. THE NAS CONSTITUTION PROVIDES THAT THE ACADEMY SHALL CONSIST OF MEMBERS, MEMBERS EMERITI AND FOREIGN ASSOCIATES. MEMBERS OF NAS ARE ELECTED BY THE MEMBERS IN RECOGNITION OF THEIR DISTINGUISHED AND CONTINUING ACHIEVEMENTS IN ORIGINAL RESEARCH. THE OFFICERS OF THE ACADEMY ARE CHOSEN FROM THE MEMBERSHIP, AND AMENDMENTS TO THE ORGANIZATION'S CONSTITUTION AND BYLAWS, AND ELECTION OF NEW MEMBERS, OFFICERS, AND COUNCIL MEMBERS REQUIRE A VOTE OF THE MEMBERS. THE OFFICERS OF THE ORGANIZATION, TOGETHER WITH TWELVE MEMBERS TO BE ELECTED, SHALL CONSTITUTE THE NATIONAL ACADEMY OF SCIENCES (NAS) COUNCIL FOR THE TRANSACTION OF SUCH BUSINESS AS MAY BE ASSIGNED TO IT BY THE CONSTITUTION, BYLAWS, OR THE MEMBERSHIP. THE NAS COUNCIL HAS GENERAL SUPERVISION OVER THE ELECTION OF THE OFFICERS OF THE ORGANIZATION, AND SHALL SET THE DATE FOR ELECTION AND APPOINTING NOMINATING COMMITTEES. THE NAS COUNCIL MAY DELEGATE ITS AUTHORITY TO APPROPRIATE OFFICIALS OF THE ORGANIZATION EXCEPT WITH RESPECT TO THOSE AUTHORITIES CONCERNING MEMBERSHIP AFFAIRS. FORM 990 REVIEW PROCESS FORM 990, PART VI, SECTION B, LINE 11 THE DRAFT 990 IS PREPARED BY THE OFFICE OF THE CHIEF FINANCIAL OFFICER. IT IS REVIEWED BY THE OFFICE OF GENERAL COUNSEL AND AN EXTERNAL TAX ADVISOR BEFORE BEING REVIEWED BY THE AUDITING COMMITTEE. THE FINAL FORM IS THEN PROVIDED TO THE NAS COUNCIL PRIOR TO FILING.</ExplanationTxt>
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        <FormAndLineReferenceDesc>CONFLICT OF INTEREST POLICY MONITORING AND ENFORCEMENT</FormAndLineReferenceDesc>
        <ExplanationTxt>FORM 990, PART VI, SECTION B, LINES 12B AND 12C ANNUALLY, THE GENERAL COUNSEL LEADS A DISCUSSION AT A MEETING OF OFFICERS AND COUNCIL MEMBERS AT WHICH THE CONFLICT OF INTEREST POLICY IS REVIEWED. OFFICERS AND COUNCIL MEMBERS ARE ASKED TO SIGN A STATEMENT THAT THEY WILL ABIDE BY THE ORGANIZATION'S CONFLICT OF INTEREST POLICIES AND PROCEDURES. OFFICERS, COUNCIL MEMBERS, AND KEY EMPLOYEES ARE ASKED TO COMPLETE AN ANNUAL QUESTIONNAIRE REGARDING CERTAIN BUSINESS TRANSACTIONS THAT COULD POTENTIALLY RESULT IN A CONFLICT OF INTEREST.</ExplanationTxt>
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        <FormAndLineReferenceDesc>PROCESS OF DETERMINING COMPENSATION</FormAndLineReferenceDesc>
        <ExplanationTxt>FORM 990, PART VI, SECTION B, LINE 15 COMPENSATION DECISIONS FOR ALL DISQUALIFIED PERSONS AS DEFINED IN IRC SECTION 4958 ARE MADE ANNUALLY BY AN EXECUTIVE COMPENSATION COMMITTEE COMPOSED OF INDEPENDENT MEMBERS ON THE BASIS OF EXECUTIVE COMPENSATION COMPATIBILITY DATA, INCLUDING A MARKET COMPENSATION SURVEY CONDUCTED BY THE OFFICE OF HUMAN RESOURCES THAT REVIEWS THE COMPENSATION OF THE HEADS OF THE LEADING UNIVERSITIES AND CHIEF EXECUTIVE OFFICERS OF SIMILAR ORGANIZATIONS. THERE IS A RECORD OF THE EXECUTIVE COMPENSATION COMMITTEE'S DELIBERATIONS AND DECISIONS. COMPENSATION DECISIONS ARE MADE ANNUALLY FOR OTHER KEY AND HIGH PAID EMPLOYEES BY SENIOR STAFF ON THE BASIS OF COMPARIBILITY DATA.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990 REQUIRED TO BE FILED ALONG WITH STATES</FormAndLineReferenceDesc>
        <ExplanationTxt>FORM 990, PART VI, SECTION C, LINE 17 NAS FILES CHARITABLE SOLICITATION REGISTRATIONS WITH A 990 ATTACHED IN THE FOLLOWING STATES: AL, AR, CO, FL, GA, HI, KY, MD, MA, MI, MN, NH, NJ, NM, NY, ND, OH, OK, PA, RI, TN, UT, VA, WA, WV, AND WI.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>HOW DOCUMENTS ARE MADE AVAILABLE TO THE PUBLIC</FormAndLineReferenceDesc>
        <ExplanationTxt>FORM 990, PART VI, SECTION C, LINE 19 NAS MAKES ITS GOVERNING DOCUMENTS, CONFLICT OF INTEREST POLICY, AND FINANCIAL STATEMENTS AVAILABLE TO THE PUBLIC UPON REQUEST. THE GOVERNING DOCUMENTS AND ANNUAL FINANCIAL STATEMENTS ARE ALSO AVAILABLE ON THE ORGANIZATION'S WEBSITE.</ExplanationTxt>
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        <ExplanationTxt>FORM 990, PART XI, LINE 9 AMOUNT CONSISTS OF: UNREALIZED Loss ON DERIVATIVES $(70,664) UNREALIZED Gain ON CHARITABLE GIFT ANNUITIES 180,467 --------------- $109,803</ExplanationTxt>
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