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        <PersonNm>Barbara Seligman</PersonNm>
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        <CurrentTaxYearMinus2YearsAmt>7956835</CurrentTaxYearMinus2YearsAmt>
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        <CurrentTaxYearAmt>10066602</CurrentTaxYearAmt>
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        <CurrentTaxYearAmt>0</CurrentTaxYearAmt>
        <TotalAmt>1627</TotalAmt>
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      <PublicSupportCY170Pct>0.70570</PublicSupportCY170Pct>
      <PublicSupportPY170Pct>0.69354</PublicSupportPY170Pct>
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        <EndYearBalanceAmt>56880</EndYearBalanceAmt>
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        <BeginningYearBalanceAmt>56880</BeginningYearBalanceAmt>
        <EndYearBalanceAmt>56880</EndYearBalanceAmt>
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        <EndYearBalanceAmt>56880</EndYearBalanceAmt>
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        <EndYearBalanceAmt>56880</EndYearBalanceAmt>
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        <BeginningYearBalanceAmt>56880</BeginningYearBalanceAmt>
        <EndYearBalanceAmt>56880</EndYearBalanceAmt>
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      <EndowmentsHeldRelatedOrgInd>false</EndowmentsHeldRelatedOrgInd>
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        <OtherCostOrOtherBasisAmt>840656</OtherCostOrOtherBasisAmt>
        <DepreciationAmt>617648</DepreciationAmt>
        <BookValueAmt>223008</BookValueAmt>
      </LeaseholdImprovementsGrp>
      <EquipmentGrp>
        <OtherCostOrOtherBasisAmt>939054</OtherCostOrOtherBasisAmt>
        <DepreciationAmt>719976</DepreciationAmt>
        <BookValueAmt>219078</BookValueAmt>
      </EquipmentGrp>
      <OtherLandBuildingsGrp />
      <TotalBookValueLandBuildingsAmt>442086</TotalBookValueLandBuildingsAmt>
      <FederalIncomeTaxLiabilityAmt>0</FederalIncomeTaxLiabilityAmt>
      <OtherLiabilitiesOrgGrp>
        <Desc>DEFERRED RENT</Desc>
        <Amt>832708</Amt>
      </OtherLiabilitiesOrgGrp>
      <TotalLiabilityAmt>832708</TotalLiabilityAmt>
      <FootnoteTextInd>X</FootnoteTextInd>
      <TotalRevEtcAuditedFinclStmtAmt>11351126</TotalRevEtcAuditedFinclStmtAmt>
      <NetUnrealizedGainsInvstAmt>446047</NetUnrealizedGainsInvstAmt>
      <RevenueNotReportedAmt>446047</RevenueNotReportedAmt>
      <RevenueSubtotalAmt>10905079</RevenueSubtotalAmt>
      <TotalRevenuePerForm990Amt>10905079</TotalRevenuePerForm990Amt>
      <TotExpnsEtcAuditedFinclStmtAmt>10879005</TotExpnsEtcAuditedFinclStmtAmt>
      <ExpensesSubtotalAmt>10879005</ExpensesSubtotalAmt>
      <TotalExpensesPerForm990Amt>10879005</TotalExpensesPerForm990Amt>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part V, Line 4:</FormAndLineReferenceDesc>
        <ExplanationTxt>Permanently restricted net assets consist of contributions received in which the donors permanently restricted the assets for endowment purposes. The income earned on the investments is temporarily restricted until appropriated and generally used in the period it is earned.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part X, Line 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>PRB follows the provisions of the Financial Accounting Standards Board (FASB) Accounting Standards Codification (ASC) 740-10, Accounting for Uncertainty in Income Taxes. Income tax benefits are recognized for income tax positions taken or expected to be taken in a tax return only when it is determined that the income tax position will more-likely-than- not be sustained upon examination by taxing authorities. PRB has analyzed tax positions taken for filing with the Internal Revenue Service and all state jurisdictions where it operates. PRB believes that income tax filing positions will be sustained upon examination and does not anticipate any adjustments that would result in a material adverse effect on PRBs financial position, results of activities or cash flows. Accordingly, PRB has not recorded any reserves or related accruals for taxes, interest and penalties for uncertain income tax positions at September 30, 2018 and 2017. PRB is open to examination by taxing authorities from 2015 forward.</ExplanationTxt>
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        <RegionTxt>Sub-Saharan Africa</RegionTxt>
        <TypeOfActivitiesConductedTxt>Grantmaking</TypeOfActivitiesConductedTxt>
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      <SubtotalSpentAmt>340450</SubtotalSpentAmt>
      <TotalSpentAmt>340450</TotalSpentAmt>
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        <RegionTxt>Sub-Saharan Africa</RegionTxt>
        <PurposeOfGrantTxt>ADVOCACY</PurposeOfGrantTxt>
        <CashGrantAmt>76234</CashGrantAmt>
        <MannerOfCashDisbursementTxt>Wire</MannerOfCashDisbursementTxt>
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      <GrantsToOrgOutsideUSGrp>
        <RegionTxt>Sub-Saharan Africa</RegionTxt>
        <PurposeOfGrantTxt>ADVOCACY</PurposeOfGrantTxt>
        <CashGrantAmt>58705</CashGrantAmt>
        <MannerOfCashDisbursementTxt>Wire</MannerOfCashDisbursementTxt>
      </GrantsToOrgOutsideUSGrp>
      <GrantsToOrgOutsideUSGrp>
        <RegionTxt>Sub-Saharan Africa</RegionTxt>
        <PurposeOfGrantTxt>See Part V</PurposeOfGrantTxt>
        <CashGrantAmt>50274</CashGrantAmt>
        <MannerOfCashDisbursementTxt>Wire</MannerOfCashDisbursementTxt>
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      <GrantsToOrgOutsideUSGrp>
        <RegionTxt>Sub-Saharan Africa</RegionTxt>
        <PurposeOfGrantTxt>ADVOCACY</PurposeOfGrantTxt>
        <CashGrantAmt>24746</CashGrantAmt>
        <MannerOfCashDisbursementTxt>Wire</MannerOfCashDisbursementTxt>
      </GrantsToOrgOutsideUSGrp>
      <GrantsToOrgOutsideUSGrp>
        <RegionTxt>Sub-Saharan Africa</RegionTxt>
        <PurposeOfGrantTxt>CAPACITY BUILDING</PurposeOfGrantTxt>
        <CashGrantAmt>90000</CashGrantAmt>
        <MannerOfCashDisbursementTxt>Wire</MannerOfCashDisbursementTxt>
      </GrantsToOrgOutsideUSGrp>
      <GrantsToOrgOutsideUSGrp>
        <RegionTxt>Sub-Saharan Africa</RegionTxt>
        <PurposeOfGrantTxt>See Part V</PurposeOfGrantTxt>
        <CashGrantAmt>18991</CashGrantAmt>
        <MannerOfCashDisbursementTxt>Wire</MannerOfCashDisbursementTxt>
      </GrantsToOrgOutsideUSGrp>
      <GrantsToOrgOutsideUSGrp>
        <RegionTxt>Sub-Saharan Africa</RegionTxt>
        <PurposeOfGrantTxt>See Part V</PurposeOfGrantTxt>
        <CashGrantAmt>19000</CashGrantAmt>
        <MannerOfCashDisbursementTxt>Wire</MannerOfCashDisbursementTxt>
      </GrantsToOrgOutsideUSGrp>
      <Total501c3OrgCnt>7</Total501c3OrgCnt>
      <TotalOtherOrgCnt>0</TotalOtherOrgCnt>
      <TransferToForeignCorpInd>false</TransferToForeignCorpInd>
      <InterestInForeignTrustInd>false</InterestInForeignTrustInd>
      <ForeignCorpOwnershipInd>false</ForeignCorpOwnershipInd>
      <PassiveForeignInvestmestCoInd>false</PassiveForeignInvestmestCoInd>
      <ForeignPartnershipInd>false</ForeignPartnershipInd>
      <BoycottCountriesInd>false</BoycottCountriesInd>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part I, Line 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>PRB issues a Request for Proposals, which are carefully reviewed by both internal and external reviewers. Once the successful applicants are chosen, a PRB program manager and a PRB financial administrator manage the project.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part I and II:</FormAndLineReferenceDesc>
        <ExplanationTxt>The accrual basis of accounting is used to report the amounts listed in Parts I and II.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART II, LINE 1:</FormAndLineReferenceDesc>
        <ExplanationTxt>COLUMN (D) - PURPOSE OF GRANT OR ASSISTANCE: 3) POLICY COMMUNICATIONS TRAINING 6) COMMUNICATION &amp; DISSEMINATION 7) COMMUNICATION &amp; DISSEMINATION</ExplanationTxt>
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    </IRS990ScheduleF>
    <IRS990ScheduleI documentId="IRS990ScheduleI">
      <GrantRecordsMaintainedInd>true</GrantRecordsMaintainedInd>
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          <BusinessNameLine1Txt>INTERNATIONAL YOUTH ALLIANCE FOR FAMILY PLANNING</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>1750 HARVARD ST NW 3B</AddressLine1Txt>
          <CityNm>WASHINGTON</CityNm>
          <StateAbbreviationCd>DC</StateAbbreviationCd>
          <ZIPCd>20009</ZIPCd>
        </USAddress>
        <RecipientEIN>386006309</RecipientEIN>
        <IRCSectionDesc>501(C)(3)</IRCSectionDesc>
        <CashGrantAmt>142851</CashGrantAmt>
        <PurposeOfGrantTxt>Sub-grant for youth policy advocacy.</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>DEVELOPING RADIO PARTNERS</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>910 17TH ST NW</AddressLine1Txt>
          <AddressLine2Txt>7TH FL</AddressLine2Txt>
          <CityNm>Washington</CityNm>
          <StateAbbreviationCd>DC</StateAbbreviationCd>
          <ZIPCd>20006</ZIPCd>
        </USAddress>
        <RecipientEIN>061710103</RecipientEIN>
        <IRCSectionDesc>501(c)(3)</IRCSectionDesc>
        <CashGrantAmt>81421</CashGrantAmt>
        <PurposeOfGrantTxt>Sub-grant for community radio stations and youth journalists engagement in Malawi</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>MIGRATION POLICY INSTITUTE</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>1400 16TH ST NW 300</AddressLine1Txt>
          <CityNm>Washington</CityNm>
          <StateAbbreviationCd>DC</StateAbbreviationCd>
          <ZIPCd>20036</ZIPCd>
        </USAddress>
        <RecipientEIN>522279789</RecipientEIN>
        <IRCSectionDesc>501(c)(3)</IRCSectionDesc>
        <CashGrantAmt>20000</CashGrantAmt>
        <PurposeOfGrantTxt>Sub-grant for Data Matters Guide revision</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>WOODROW WILSON INTERNATIONAL CENTER FOR SCHOLARS</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>1300 PENNSYLVANIA AVE NW</AddressLine1Txt>
          <CityNm>Washington</CityNm>
          <StateAbbreviationCd>DC</StateAbbreviationCd>
          <ZIPCd>20004</ZIPCd>
        </USAddress>
        <RecipientEIN>521067541</RecipientEIN>
        <IRCSectionDesc>501(c)(3)</IRCSectionDesc>
        <CashGrantAmt>73177</CashGrantAmt>
        <PurposeOfGrantTxt>Sub-grant for policy dialogues around Sustainable Development Goals</PurposeOfGrantTxt>
      </RecipientTable>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part I, Line 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>PRB follows OMB's Uniform Guidance regulations before procuring any goods and services. PRB issues a Request for Proposals, which are carefully reviewed by both internal and external reviewers. Once the successful applicants are chosen, a PRB program manager and a PRB financial administrator manage the project.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART II, LINE 1</FormAndLineReferenceDesc>
        <ExplanationTxt>COLUMN (H) - PURPOSE OF GRANT OR ASSISTANCE 1) Sub-grant for youth policy advocacy. 2) Sub-grant for community radio stations and youth journalists engagement in Malawi 3) Sub-grant for Data Matters Guide revision 4) Sub-grant for policy dialogues around Sustainable Development Goals</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleI>
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      <IndependentConsultantInd>X</IndependentConsultantInd>
      <Form990OfOtherOrganizationsInd>X</Form990OfOtherOrganizationsInd>
      <CompensationSurveyInd>X</CompensationSurveyInd>
      <BoardOrCommitteeApprovalInd>X</BoardOrCommitteeApprovalInd>
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      <AnyNonFixedPaymentsInd>false</AnyNonFixedPaymentsInd>
      <InitialContractExceptionInd>false</InitialContractExceptionInd>
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        <PersonNm>Jeffrey N Jordan</PersonNm>
        <TitleTxt>Trustee, President and CEO</TitleTxt>
        <BaseCompensationFilingOrgAmt>279375</BaseCompensationFilingOrgAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
        <DeferredCompensationFlngOrgAmt>22104</DeferredCompensationFlngOrgAmt>
        <NontaxableBenefitsFilingOrgAmt>25803</NontaxableBenefitsFilingOrgAmt>
        <TotalCompensationFilingOrgAmt>327282</TotalCompensationFilingOrgAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Viresh Desai</PersonNm>
        <TitleTxt>CFO</TitleTxt>
        <BaseCompensationFilingOrgAmt>196809</BaseCompensationFilingOrgAmt>
        <BonusFilingOrganizationAmount>1000</BonusFilingOrganizationAmount>
        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
        <DeferredCompensationFlngOrgAmt>14859</DeferredCompensationFlngOrgAmt>
        <NontaxableBenefitsFilingOrgAmt>18837</NontaxableBenefitsFilingOrgAmt>
        <TotalCompensationFilingOrgAmt>231505</TotalCompensationFilingOrgAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Barbara Seligman</PersonNm>
        <TitleTxt>VP-International Programs</TitleTxt>
        <BaseCompensationFilingOrgAmt>203737</BaseCompensationFilingOrgAmt>
        <BonusFilingOrganizationAmount>1500</BonusFilingOrganizationAmount>
        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
        <DeferredCompensationFlngOrgAmt>14564</DeferredCompensationFlngOrgAmt>
        <NontaxableBenefitsFilingOrgAmt>2881</NontaxableBenefitsFilingOrgAmt>
        <TotalCompensationFilingOrgAmt>222682</TotalCompensationFilingOrgAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Linda A Jacobsen</PersonNm>
        <TitleTxt>VP-U.S. Programs</TitleTxt>
        <BaseCompensationFilingOrgAmt>185736</BaseCompensationFilingOrgAmt>
        <BonusFilingOrganizationAmount>1250</BonusFilingOrganizationAmount>
        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
        <DeferredCompensationFlngOrgAmt>13722</DeferredCompensationFlngOrgAmt>
        <NontaxableBenefitsFilingOrgAmt>22046</NontaxableBenefitsFilingOrgAmt>
        <TotalCompensationFilingOrgAmt>222754</TotalCompensationFilingOrgAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Peter C Goldstein</PersonNm>
        <TitleTxt>VP-Communications &amp; Marketing</TitleTxt>
        <BaseCompensationFilingOrgAmt>172426</BaseCompensationFilingOrgAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
        <DeferredCompensationFlngOrgAmt>12661</DeferredCompensationFlngOrgAmt>
        <NontaxableBenefitsFilingOrgAmt>4635</NontaxableBenefitsFilingOrgAmt>
        <TotalCompensationFilingOrgAmt>189722</TotalCompensationFilingOrgAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Mark S Mather</PersonNm>
        <TitleTxt>Associate VP-U.S. Programs</TitleTxt>
        <BaseCompensationFilingOrgAmt>138618</BaseCompensationFilingOrgAmt>
        <BonusFilingOrganizationAmount>1000</BonusFilingOrganizationAmount>
        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
        <DeferredCompensationFlngOrgAmt>9525</DeferredCompensationFlngOrgAmt>
        <NontaxableBenefitsFilingOrgAmt>2778</NontaxableBenefitsFilingOrgAmt>
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        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
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        <FormAndLineReferenceDesc>FORM 990, PART I, LINE 1:</FormAndLineReferenceDesc>
        <ExplanationTxt>The Population Reference Bureau informs people around the world about population, health and the environment, and empowers them to use that information to advance the well-being of current and future generations.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 1:</FormAndLineReferenceDesc>
        <ExplanationTxt>PRB'S EXECUTIVE COMMITTEE MEETS EVERY TWO MONTHS AND IS EMPOWERED TO ACT ON BEHALF OF THE FULL BOARD OF TRUSTEES. THE FULL BOARD OF TRUSTEES MEETS TWICE A YEAR IN PERSON AND ONCE VIA TELECONFERENCE.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART IV, SECTION B, LINE 11:</FormAndLineReferenceDesc>
        <ExplanationTxt>The organization's Form 990 undergoes a number of internal and external reviews before it is filed with the IRS. The return is prepared by the organization's public accounting firm, BDO USA and is reviewed by the organization's Chief Financial Officer. A final draft of the Form 990 is provided to each member of the organization's Board of Trustees for final review. BDO walks through various schedules of the Form 990 with full Board and answers any questions. After a Board quorum approves the Form 990, the President/CEO signs the return and BDO files it electronically with the IRS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART IV, SECTION B, LINE 12C:</FormAndLineReferenceDesc>
        <ExplanationTxt>Each Trustee, Director, Officer, and Key Employee completes a Conflict of Interest questionnaire which is reviewed by the CFO and the Chair of the Audit Committee. Any questions are followed up the Audit Committee Chair and a full report is given to the Board of Trustees.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 15:</FormAndLineReferenceDesc>
        <ExplanationTxt>15a: President/CEO compensation is determined by the PRB Executive Committee and approved by the full Board of Trustees. The CEO and CFO review performance and compensation for department VPs and senior staff. Department VPs review performance and compensation for their department employees. The VPs meet together to review compensation recommendations to ensure equity across departments. Key employee and VP compensation is determined by the CEO and CFO, in conjunction with a review by the HR Director. Comparability data from similar organizations is used to compare both base salaries and increases. 15b: Key employee and VP compensation is determined by the CEO and CFO, in conjunction with a review by the HR Director. Comparability data from similar organizations is used to compare both base salaries and increases.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION C, LINE 19:</FormAndLineReferenceDesc>
        <ExplanationTxt>The organization makes its governing documents, conflict of interest policy, and financial statements available to the public upon request and by way of Guidestar. Additionally, the Financial Statements are available in the organization's annual report and on PRB website.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART XII, LINE 2C:</FormAndLineReferenceDesc>
        <ExplanationTxt>There have been no changes during the year in the process for oversight of the audit of the financial statements.</ExplanationTxt>
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</Return>