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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>EDMUND BERTSCHINGER</PersonNm>
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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>JOAN SCHMELZ - TERM ENDED</PersonNm>
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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>MEGAN DONAHUE - TERM ENDED</PersonNm>
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        <OfficerInd>X</OfficerInd>
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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>MARCEL AGUEROS - TERM ENDED</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>TEREASA BRAINERD - TERM ENDED</PersonNm>
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        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>KEVIN B MARVEL</PersonNm>
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      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>JOEL PARRIOTT</PersonNm>
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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>23010</OtherCompensationAmt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>KELLY E CLARK</PersonNm>
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        <OfficerInd>X</OfficerInd>
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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>34084</OtherCompensationAmt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>ETHAN VISHNIAC</PersonNm>
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        <HighestCompensatedEmployeeInd>X</HighestCompensatedEmployeeInd>
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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
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      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>JULIE STEFFEN</PersonNm>
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        <OtherCompensationAmt>38926</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>ELIZABETH SCUDERI</PersonNm>
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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>DIANE FRENDAK</PersonNm>
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        <OtherCompensationAmt>41714</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>TIM ALLEN</PersonNm>
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        <ReportableCompFromOrgAmt>112588</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
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      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1Txt>IOP PUBLISHING</BusinessNameLine1Txt>
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        <ContractorAddress>
          <ForeignAddress>
            <AddressLine1Txt>TEMPLE CIRCUS</AddressLine1Txt>
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            <ProvinceOrStateNm>BRISTOL</ProvinceOrStateNm>
            <CountryCd>UK</CountryCd>
            <ForeignPostalCd>BS1 6HG</ForeignPostalCd>
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      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1Txt>LSC COMMUNICATIONS</BusinessNameLine1Txt>
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        <ContractorAddress>
          <USAddress>
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            <StateAbbreviationCd>MO</StateAbbreviationCd>
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      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1Txt>CLEARVIEW CONSULTING INC</BusinessNameLine1Txt>
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        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>11155 RED RUN BOULEVARD SUITE 410</AddressLine1Txt>
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            <ZIPCd>21117</ZIPCd>
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      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1Txt>NORTHWESTERN UNIVERSITY</BusinessNameLine1Txt>
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        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>1918 SHERIDAN ROAD</AddressLine1Txt>
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      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1Txt>AERO FULFILLMENT</BusinessNameLine1Txt>
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        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>PO BOX 444</AddressLine1Txt>
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            <ZIPCd>45034</ZIPCd>
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        </ContractorAddress>
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        <CompensationAmt>201047</CompensationAmt>
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      <CntrctRcvdGreaterThan100KCnt>7</CntrctRcvdGreaterThan100KCnt>
      <MembershipDuesAmt>1223005</MembershipDuesAmt>
      <GovernmentGrantsAmt>338802</GovernmentGrantsAmt>
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      <TotalContributionsAmt>2174277</TotalContributionsAmt>
      <ProgramServiceRevenueGrp>
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      <ProgramServiceRevenueGrp>
        <Desc>S&amp;T MAGAZINES</Desc>
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      <ProgramServiceRevenueGrp>
        <Desc>MEETINGS</Desc>
        <BusinessCd>900099</BusinessCd>
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      <ProgramServiceRevenueGrp>
        <Desc>S&amp;T TOURS AND SALES</Desc>
        <BusinessCd>900099</BusinessCd>
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        <SecuritiesAmt>1427226</SecuritiesAmt>
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        <SecuritiesAmt>404820</SecuritiesAmt>
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        <TotalRevenueColumnAmt>404820</TotalRevenueColumnAmt>
        <ExclusionAmt>404820</ExclusionAmt>
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        <Desc>OTHER</Desc>
        <BusinessCd>900099</BusinessCd>
        <TotalRevenueColumnAmt>41614</TotalRevenueColumnAmt>
        <ExclusionAmt>41614</ExclusionAmt>
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      <TotalRevenueGrp>
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        <UnrelatedBusinessRevenueAmt>1085135</UnrelatedBusinessRevenueAmt>
        <ExclusionAmt>783881</ExclusionAmt>
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      <GrantsToDomesticOrgsGrp>
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        <ProgramServicesAmt>25460</ProgramServicesAmt>
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      <GrantsToDomesticIndividualsGrp>
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        <ProgramServicesAmt>805912</ProgramServicesAmt>
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        <ProgramServicesAmt>229060</ProgramServicesAmt>
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        <ProgramServicesAmt>4443036</ProgramServicesAmt>
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        <ProgramServicesAmt>153536</ProgramServicesAmt>
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        <ProgramServicesAmt>432305</ProgramServicesAmt>
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        <ProgramServicesAmt>205340</ProgramServicesAmt>
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      <FeesForServicesManagementGrp>
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        <ManagementAndGeneralAmt>150242</ManagementAndGeneralAmt>
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      <FeesForServicesAccountingGrp>
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        <ProgramServicesAmt>35280</ProgramServicesAmt>
        <ManagementAndGeneralAmt>21375</ManagementAndGeneralAmt>
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      <FeesForSrvcInvstMgmntFeesGrp>
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        <ManagementAndGeneralAmt>26334</ManagementAndGeneralAmt>
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        <ProgramServicesAmt>829683</ProgramServicesAmt>
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        <ProgramServicesAmt>321834</ProgramServicesAmt>
        <ManagementAndGeneralAmt>479914</ManagementAndGeneralAmt>
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        <ProgramServicesAmt>64979</ProgramServicesAmt>
        <ManagementAndGeneralAmt>10071</ManagementAndGeneralAmt>
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        <ProgramServicesAmt>482860</ProgramServicesAmt>
        <ManagementAndGeneralAmt>174634</ManagementAndGeneralAmt>
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        <ProgramServicesAmt>56348</ProgramServicesAmt>
        <ManagementAndGeneralAmt>6069</ManagementAndGeneralAmt>
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        <ProgramServicesAmt>628476</ProgramServicesAmt>
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        <ProgramServicesAmt>219984</ProgramServicesAmt>
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        <ProgramServicesAmt>11687</ProgramServicesAmt>
        <ManagementAndGeneralAmt>30939</ManagementAndGeneralAmt>
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        <ProgramServicesAmt>1565275</ProgramServicesAmt>
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        <Desc>JOURNAL PRODUCTION</Desc>
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        <ProgramServicesAmt>1335686</ProgramServicesAmt>
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        <ProgramServicesAmt>381107</ProgramServicesAmt>
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        <ProgramServicesAmt>157419</ProgramServicesAmt>
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        <ManagementAndGeneralAmt>14038</ManagementAndGeneralAmt>
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        <ProgramServicesAmt>13257137</ProgramServicesAmt>
        <ManagementAndGeneralAmt>3538467</ManagementAndGeneralAmt>
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        <EOYAmt>777555</EOYAmt>
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        <EOYAmt>554117</EOYAmt>
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        <EOYAmt>94002</EOYAmt>
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        <EOYAmt>870674</EOYAmt>
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        <EOYAmt>506843</EOYAmt>
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        <EOYAmt>474028</EOYAmt>
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        <EOYAmt>929329</EOYAmt>
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        <EOYAmt>14694166</EOYAmt>
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        <EOYAmt>91084</EOYAmt>
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        <EOYAmt>2240126</EOYAmt>
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        <EOYAmt>639253</EOYAmt>
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        <EOYAmt>21871177</EOYAmt>
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        <EOYAmt>780150</EOYAmt>
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        <EOYAmt>3246057</EOYAmt>
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        <EOYAmt>1375281</EOYAmt>
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        <EOYAmt>5401488</EOYAmt>
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        <EOYAmt>11860767</EOYAmt>
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      <DonorRestrictionNetAssetsGrp>
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        <EOYAmt>4608922</EOYAmt>
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        <EOYAmt>16469689</EOYAmt>
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        <EOYAmt>21871177</EOYAmt>
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      <InfoInScheduleOPartXIIInd>X</InfoInScheduleOPartXIIInd>
      <MethodOfAccountingAccrualInd>X</MethodOfAccountingAccrualInd>
      <AccountantCompileOrReviewInd>0</AccountantCompileOrReviewInd>
      <FSAuditedInd>1</FSAuditedInd>
      <FSAuditedBasisGrp>
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        <CashGrantAmt>750</CashGrantAmt>
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        <FormAndLineReferenceDesc>PART I, LINE 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>WHEN GRANTS ARE AWARDED, THE RECIPIENT SIGNS AN ACKNOWLEDGEMENT THAT THE FUNDS WILL BE SPENT ONLY FOR THE INTENDED PURPOSE. ALL RECEIPTS ARE COLLECTED AND REVIEWED TO ENSURE COMPLIANCE.</ExplanationTxt>
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        <PersonNm>JOEL PARRIOTT</PersonNm>
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        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
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        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
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      <BooksAndPublicationsGrp>
        <NonCashCheckboxInd>X</NonCashCheckboxInd>
        <NoncashContributionsRptF990Amt>488625</NoncashContributionsRptF990Amt>
        <MethodOfDeterminingRevenuesTxt>FAIR VALUE</MethodOfDeterminingRevenuesTxt>
      </BooksAndPublicationsGrp>
      <AnyPropertyThatMustBeHeldInd>0</AnyPropertyThatMustBeHeldInd>
      <ReviewProcessUnusualNCGiftsInd>0</ReviewProcessUnusualNCGiftsInd>
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    <IRS990ScheduleO documentId="RetDoc1044400001">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 6</FormAndLineReferenceDesc>
        <ExplanationTxt>THE AAS IS A SCIENTIFIC MEMBER SOCIETY FOR INDIVIDUALS THAT ARE ACTIVELY INVOLVED IN ASTRONOMY OR A RELATED BRANCH OF SCIENCE. THE SOCIETY HAS FULL, ASSOCIATE, INTERNATIONAL AFFILIATE, EDUCATION AFFILIATE, EMERITUS AND JUNIOR MEMBER MEMBERSHIP CLASSES. IN ORDER TO BECOME A MEMBER OF THE SOCIETY, AN INDIVIDUAL MUST HAVE TWO MEMBERS SPONSOR HIM/HER FOR MEMBERSHIP. IN ADDITION TO THE AAS MEMBER CLASSIFICATIONS, THE SIX DIVISIONS OF THE SOCIETY ALSO OFFER FULL, EMERITUS AND JUNIOR MEMBERSHIP CLASSES, DEPENDING ON THE DIVISION. CORPORATIONS AND OTHER ENTITIES DESIROUS OF ENCOURAGING THE WORK OF THE SOCIETY CAN ALSO BECOME CORPORATE MEMBERS. CORPORATE MEMBERS MUST BE APPROVED BY THE BOARD OF TRUSTEES.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 7A</FormAndLineReferenceDesc>
        <ExplanationTxt>THE GENERAL MEMBERSHIP ELECTS THE TRUSTEES OF THE SOCIETY. THE SLATE OF CANDIDATES FOR OFFICERS AND AT-LARGE TRUSTEES SHALL BE PREPARED BY THE NOMINATING COMMITTEE. AT LEAST TWO CANDIDATES SHALL BE PROPOSED BY THE NOMINATING COMMITTEE FOR FOR ALL OFFICERS AND AT-LARGE TRUSTEES. MEMBERS OF THE NOMINATING COMMITTEE ARE INELIGIBLE FOR NOMINATION TO OFFICE.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 11B</FormAndLineReferenceDesc>
        <ExplanationTxt>THE AUDIT COMMITTEE AND THE TREASURER REVIEW AND APPROVE THE 990 PRIOR TO SUBMISSION. THE 990 IS ALSO DISTRIBUTED TO THE ENTIRE BOARD OF TRUSTEES AND PLACED ON THE AAS INTERNAL BOARD CONTENT MANAGEMENT SYSTEM.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 12C</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ORGANIZATION ESTABLISHED A CONFLICT OF INTEREST POLICY IN 2010. AS A RESULT OF THIS POLICY, THE ORGANIZATION MONITORS THE CONFLICT OF INTEREST POLICY THROUGH THE USE OF A CONFLICT QUESTIONNAIRE TO BE FILLED OUT ON AN ANNUAL BASIS BY AAS TRUSTEES AND STAFF.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 15</FormAndLineReferenceDesc>
        <ExplanationTxt>THE EXECUTIVE OFFICER HAS AN ANNUAL REVIEW WITH A SUBCOMMITTEE SELECTED FROM THE OFFICERS OF THE SOCIETY. BOTH THIS SUBCOMMITTEE COMMITTEE AND THE EXECUTIVE OFFICER PREPARE WRITTEN MEMORANDUMS ON THE ANNUAL PERFORMANCE. THE SUBCOMMITTEE REVIEWS COMPENSATION REPORTS AND RECOMMENDS A SALARY INCREASE TO THE BOARD, WHICH THEY APPROVE. NON-SUPERVISORY EMPLOYEES ARE REVIEWED BY THEIR DIRECT MANAGER. THERE IS A WRITTEN PERFORMANCE REVIEW THAT IS PREPARED BY THE MANAGER AND SIGNED BY THE EMPLOYEE. SUPERVISORY EMPLOYEES ARE REVIEWED BY THE EXECUTIVE OFFICER AFTER ALL OTHER NON-SUPERVISORY EVALUATIONS ARE COMPLETED. THEY MEET AND DISCUSS THE PERFORMANCE OF THE SUPERVISORS AND THEIR SUBORDINATES' PERFORMANCE. BOTH THE EXECUTIVE OFFICER AND THE SUPERVISORY EMPLOYEE PREPARE WRITTEN PERFORMANCE REVIEWS, WHICH ARE SIGNED BY THE EMPLOYEE AND EXECUTIVE OFFICER. THE EXECUTIVE OFFICER THEN ASSESSES THE PERFORMANCE OF THE EMPLOYEES AND REVIEWS COMPENSATION DATA FROM OUR DEMOGRAPHIC AREA AND AWARDS INCREASES BASED ON THE INDIVIDUAL ASSESSMENTS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION C, LINE 19</FormAndLineReferenceDesc>
        <ExplanationTxt>ALL DOCUMENTS ARE AVAILABLE FOR PUBLIC VIEWING AT THE EXECUTIVE OFFICE. ADDITIONALLY, SUMMARIES OF ANNUAL AUDITS AND FINANCIAL REPORTS ARE AVAILABLE ON THE WEBSITE AS PART OF THE ANNUAL REPORT. WE ARE CURRENTLY MODIFYING OUR PROCEDURES FOR ENSURING THAT THE CONFLICT OF INTEREST STATEMENTS CAN BE MONITORED. THE AUDIT COMMITTEE OVERSEES THE AUDIT OF THE ORGANIZATION'S FINANCIAL STATEMENTS AND SELECTION OF AN INDEPENDENT ACCOUNTANT.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART XI, LINE 9:</FormAndLineReferenceDesc>
        <ExplanationTxt>EQUITY IN GAIN OF ACI 87,128.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART XII, LINE 2C:</FormAndLineReferenceDesc>
        <ExplanationTxt>NEITHER THE OVERSIGHT PROCESS NOR THE SELECTION PROCESS HAS CHANGED DURING THE CURRENT TAX YEAR.</ExplanationTxt>
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        </DisregardedEntityName>
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          <CityNm>WASHINGTON</CityNm>
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        <DirectControllingEntityName>
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        <DirectControllingEntityName>
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