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      <Form990PartVIISectionAGrp>
        <PersonNm>J BRYAN HEHIR</PersonNm>
        <TitleTxt>TRUSTEE</TitleTxt>
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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>MAISIE HOUGHTON</PersonNm>
        <TitleTxt>TRUSTEE</TitleTxt>
        <AverageHoursPerWeekRt>2.00</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
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      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>CLARISSA C HUNNEWELL</PersonNm>
        <TitleTxt>TRUSTEE</TitleTxt>
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        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>JAMES F HUNNEWELL JR</PersonNm>
        <TitleTxt>TRUSTEE</TitleTxt>
        <AverageHoursPerWeekRt>2.00</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>TERRANCE P MCGUIRE</PersonNm>
        <TitleTxt>TRUSTEE</TitleTxt>
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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>DAVID INGRAM</PersonNm>
        <TitleTxt>TRUSTEE</TitleTxt>
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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>CAROLYN M OSTEEN</PersonNm>
        <TitleTxt>TRUSTEE</TitleTxt>
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        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>JOHN S REED</PersonNm>
        <TitleTxt>TRUSTEE</TitleTxt>
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        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>SUSAN WEATHERBIE</PersonNm>
        <TitleTxt>TRUSTEE</TitleTxt>
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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>HUGH MCCALL</PersonNm>
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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>26830</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>ROBERT WEST</PersonNm>
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        <ReportableCompFromOrgAmt>168868</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>20908</OtherCompensationAmt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>JAMES REID-CUNNINGHAM</PersonNm>
        <TitleTxt>DEPUTY DIRECTOR</TitleTxt>
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        <HighestCompensatedEmployeeInd>X</HighestCompensatedEmployeeInd>
        <ReportableCompFromOrgAmt>122582</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>27516</OtherCompensationAmt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>JOHN LANNON</PersonNm>
        <TitleTxt>ASSOCIATE DIRECTOR</TitleTxt>
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        <ReportableCompFromOrgAmt>112391</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>17958</OtherCompensationAmt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>DAVID DEARINGER</PersonNm>
        <TitleTxt>CURATOR</TitleTxt>
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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>22063</OtherCompensationAmt>
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      <TotalReportableCompFromOrgAmt>657779</TotalReportableCompFromOrgAmt>
      <TotReportableCompRltdOrgAmt>0</TotReportableCompRltdOrgAmt>
      <TotalOtherCompensationAmt>115275</TotalOtherCompensationAmt>
      <IndivRcvdGreaterThan100KCnt>5</IndivRcvdGreaterThan100KCnt>
      <FormerOfcrEmployeesListedInd>0</FormerOfcrEmployeesListedInd>
      <TotalCompGreaterThan150KInd>1</TotalCompGreaterThan150KInd>
      <CompensationFromOtherSrcsInd>0</CompensationFromOtherSrcsInd>
      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1>CAMBRIDGE ASSOCIATES</BusinessNameLine1>
          </BusinessName>
        </ContractorName>
        <ContractorAddress>
          <USAddress>
            <AddressLine1>100 SUMMER ST</AddressLine1>
            <City>BOSTON</City>
            <State>MA</State>
            <ZIPCode>02110</ZIPCode>
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        <ServicesDesc>INVESTMENT CONSULTANT</ServicesDesc>
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      <CntrctRcvdGreaterThan100KCnt>1</CntrctRcvdGreaterThan100KCnt>
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      <NoncashContributionsAmt>121930</NoncashContributionsAmt>
      <TotalContributionsAmt>2741106</TotalContributionsAmt>
      <ProgramServiceRevenueGrp>
        <Desc>FEES FOR LIBRARY USE</Desc>
        <BusinessCd>713990</BusinessCd>
        <TotalRevenueColumnAmt>1166207</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>1166207</RelatedOrExemptFuncIncomeAmt>
      </ProgramServiceRevenueGrp>
      <ProgramServiceRevenueGrp>
        <Desc>EVENTS &amp; LECTURES</Desc>
        <BusinessCd>713990</BusinessCd>
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        <RelatedOrExemptFuncIncomeAmt>68976</RelatedOrExemptFuncIncomeAmt>
      </ProgramServiceRevenueGrp>
      <ProgramServiceRevenueGrp>
        <Desc>OTHER PROGRAM REVENUE</Desc>
        <BusinessCd>713990</BusinessCd>
        <TotalRevenueColumnAmt>35007</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>35007</RelatedOrExemptFuncIncomeAmt>
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      <ProgramServiceRevenueGrp>
        <Desc>PHOTOGRAPHIC SERVICES</Desc>
        <BusinessCd>713990</BusinessCd>
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        <RelatedOrExemptFuncIncomeAmt>14393</RelatedOrExemptFuncIncomeAmt>
      </ProgramServiceRevenueGrp>
      <TotalProgramServiceRevenueAmt>1284583</TotalProgramServiceRevenueAmt>
      <InvestmentIncomeGrp>
        <TotalRevenueColumnAmt>879162</TotalRevenueColumnAmt>
        <ExclusionAmt>879162</ExclusionAmt>
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      <RoyaltiesRevenueGrp>
        <TotalRevenueColumnAmt>1197</TotalRevenueColumnAmt>
        <ExclusionAmt>1197</ExclusionAmt>
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      <GrossRentsGrp>
        <RealAmt>39500</RealAmt>
      </GrossRentsGrp>
      <LessRentalExpensesGrp>
        <RealAmt>12796</RealAmt>
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      <RentalIncomeOrLossGrp>
        <RealAmt>26704</RealAmt>
      </RentalIncomeOrLossGrp>
      <NetRentalIncomeOrLossGrp>
        <TotalRevenueColumnAmt>26704</TotalRevenueColumnAmt>
        <ExclusionAmt>26704</ExclusionAmt>
      </NetRentalIncomeOrLossGrp>
      <GrossAmountSalesAssetsGrp>
        <SecuritiesAmt>24728748</SecuritiesAmt>
      </GrossAmountSalesAssetsGrp>
      <LessCostOthBasisSalesExpnssGrp>
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      <GainOrLossGrp>
        <SecuritiesAmt>1059458</SecuritiesAmt>
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      <NetGainOrLossInvestmentsGrp>
        <TotalRevenueColumnAmt>1059458</TotalRevenueColumnAmt>
        <ExclusionAmt>1059458</ExclusionAmt>
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      <GrossSalesOfInventoryAmt>5795</GrossSalesOfInventoryAmt>
      <CostOfGoodsSoldAmt>3715</CostOfGoodsSoldAmt>
      <NetIncomeOrLossGrp>
        <TotalRevenueColumnAmt>2080</TotalRevenueColumnAmt>
        <ExclusionAmt>2080</ExclusionAmt>
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      <OtherRevenueMiscGrp>
        <Desc>OTHER REVENUE</Desc>
        <BusinessCd>900099</BusinessCd>
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        <ExclusionAmt>2996</ExclusionAmt>
      </OtherRevenueMiscGrp>
      <OtherRevenueTotalAmt>2996</OtherRevenueTotalAmt>
      <TotalRevenueGrp>
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        <RelatedOrExemptFuncIncomeAmt>1284583</RelatedOrExemptFuncIncomeAmt>
        <UnrelatedBusinessRevenueAmt>0</UnrelatedBusinessRevenueAmt>
        <ExclusionAmt>1971597</ExclusionAmt>
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      <GrantsToDomesticOrgsGrp>
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        <ProgramServicesAmt>5000</ProgramServicesAmt>
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      <GrantsToDomesticIndividualsGrp>
        <TotalAmt>9500</TotalAmt>
        <ProgramServicesAmt>9500</ProgramServicesAmt>
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      <CompCurrentOfcrDirectorsGrp>
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        <ManagementAndGeneralAmt>187042</ManagementAndGeneralAmt>
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        <ProgramServicesAmt>2237978</ProgramServicesAmt>
        <ManagementAndGeneralAmt>166008</ManagementAndGeneralAmt>
        <FundraisingAmt>283367</FundraisingAmt>
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        <FundraisingAmt>26406</FundraisingAmt>
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        <ProgramServicesAmt>212688</ProgramServicesAmt>
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        <ManagementAndGeneralAmt>2419</ManagementAndGeneralAmt>
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      <FeesForServicesAccountingGrp>
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        <ManagementAndGeneralAmt>49360</ManagementAndGeneralAmt>
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      <FeesForSrvcInvstMgmntFeesGrp>
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        <ManagementAndGeneralAmt>291378</ManagementAndGeneralAmt>
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        <FundraisingAmt>11467</FundraisingAmt>
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        <ProgramServicesAmt>13925</ProgramServicesAmt>
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        <ProgramServicesAmt>11007</ProgramServicesAmt>
        <ManagementAndGeneralAmt>72340</ManagementAndGeneralAmt>
        <FundraisingAmt>14810</FundraisingAmt>
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        <ProgramServicesAmt>910515</ProgramServicesAmt>
        <ManagementAndGeneralAmt>14928</ManagementAndGeneralAmt>
        <FundraisingAmt>8293</FundraisingAmt>
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      <ConferencesMeetingsGrp>
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        <ProgramServicesAmt>5037</ProgramServicesAmt>
        <ManagementAndGeneralAmt>6109</ManagementAndGeneralAmt>
        <FundraisingAmt>1695</FundraisingAmt>
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        <ProgramServicesAmt>887137</ProgramServicesAmt>
        <ManagementAndGeneralAmt>14313</ManagementAndGeneralAmt>
        <FundraisingAmt>7952</FundraisingAmt>
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        <ProgramServicesAmt>22500</ProgramServicesAmt>
        <ManagementAndGeneralAmt>22604</ManagementAndGeneralAmt>
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        <Desc>COLLECTIONS AQUISITIONS</Desc>
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        <ProgramServicesAmt>437491</ProgramServicesAmt>
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      <OtherExpensesGrp>
        <Desc>RECEPTION/ENTERTAINMENT</Desc>
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        <ProgramServicesAmt>100010</ProgramServicesAmt>
        <ManagementAndGeneralAmt>26591</ManagementAndGeneralAmt>
        <FundraisingAmt>70967</FundraisingAmt>
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      <OtherExpensesGrp>
        <Desc>PRINTING &amp; PUBLICATIONS</Desc>
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        <ProgramServicesAmt>50586</ProgramServicesAmt>
        <ManagementAndGeneralAmt>45480</ManagementAndGeneralAmt>
        <FundraisingAmt>22298</FundraisingAmt>
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      <OtherExpensesGrp>
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        <ProgramServicesAmt>9595</ProgramServicesAmt>
        <ManagementAndGeneralAmt>25414</ManagementAndGeneralAmt>
        <FundraisingAmt>5142</FundraisingAmt>
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      <AllOtherExpensesGrp>
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        <ProgramServicesAmt>10088</ProgramServicesAmt>
        <ManagementAndGeneralAmt>51445</ManagementAndGeneralAmt>
        <FundraisingAmt>583</FundraisingAmt>
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      <TotalFunctionalExpensesGrp>
        <TotalAmt>7242296</TotalAmt>
        <ProgramServicesAmt>5326311</ProgramServicesAmt>
        <ManagementAndGeneralAmt>1392038</ManagementAndGeneralAmt>
        <FundraisingAmt>523947</FundraisingAmt>
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        <EOYAmt>4959758</EOYAmt>
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        <EOYAmt>1229517</EOYAmt>
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        <EOYAmt>41145</EOYAmt>
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      <LandBldgEquipBasisNetGrp>
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        <EOYAmt>23313112</EOYAmt>
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        <EOYAmt>47496419</EOYAmt>
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        <EOYAmt>37867727</EOYAmt>
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        <EOYAmt>737325</EOYAmt>
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      <TotalAssetsGrp>
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        <EOYAmt>115800894</EOYAmt>
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        <EOYAmt>634045</EOYAmt>
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        <EOYAmt>1279406</EOYAmt>
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        <EOYAmt>71817409</EOYAmt>
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        <EOYAmt>114521488</EOYAmt>
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      <TotLiabNetAssetsFundBalanceGrp>
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        <EOYAmt>115800894</EOYAmt>
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      <NetUnrlzdGainsLossesInvstAmt>6488822</NetUnrlzdGainsLossesInvstAmt>
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      <MethodOfAccountingAccrualInd>X</MethodOfAccountingAccrualInd>
      <AccountantCompileOrReviewInd>0</AccountantCompileOrReviewInd>
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      <FSAuditedBasisGrp>
        <ConsolidatedBasisFinclStmtInd>X</ConsolidatedBasisFinclStmtInd>
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      <AuditCommitteeInd>1</AuditCommitteeInd>
      <FederalGrantAuditRequiredInd>0</FederalGrantAuditRequiredInd>
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    <IRS990ScheduleA documentId="RetDoc1039100001">
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        <CurrentTaxYearMinus3YearsAmt>1509802</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>3009002</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>1447478</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>2741106</CurrentTaxYearAmt>
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        <CurrentTaxYearMinus1YearAmt>1447478</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>2741106</CurrentTaxYearAmt>
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      <PublicSupportTotal170Amt>9468654</PublicSupportTotal170Amt>
      <GrossInvestmentIncome170Grp>
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        <CurrentTaxYearMinus3YearsAmt>1024853</CurrentTaxYearMinus3YearsAmt>
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        <FormAndLineReferenceDesc>SCHEDULE A, PART IV, LIST OF UNUSUAL GRANTS:</FormAndLineReferenceDesc>
        <ExplanationTxt>DESCRIPTION: BEQUEST DATE: 09/30/10 AMOUNT: 1268899. DESCRIPTION: BEQUEST DATE: 09/30/11 AMOUNT: 33858.</ExplanationTxt>
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        <ContributorBusinessName>
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          <AddressLine1>RESTRICTED</AddressLine1>
          <AddressLine2>RESTRICTED</AddressLine2>
          <City>RESTRICTED</City>
          <State>RESTRICTED</State>
          <ZIPCode>RESTRICTED</ZIPCode>
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      <CollUsedScholarlyRsrchInd>X</CollUsedScholarlyRsrchInd>
      <CollectionUsedPreservationInd>X</CollectionUsedPreservationInd>
      <CollUsedLoanOrExchProgInd>X</CollUsedLoanOrExchProgInd>
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      <TotalBookValueLandBuildingsAmt>23313112</TotalBookValueLandBuildingsAmt>
      <OtherSecuritiesGrp>
        <Desc>PARTNERSHIPS - HEDGE FUND OF FUNDS</Desc>
        <BookValueAmt>18166545</BookValueAmt>
        <MethodValuationCd>F</MethodValuationCd>
      </OtherSecuritiesGrp>
      <OtherSecuritiesGrp>
        <Desc>PARTNERSHIPS - EQUITY FUNDS</Desc>
        <BookValueAmt>19701182</BookValueAmt>
        <MethodValuationCd>F</MethodValuationCd>
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      <TotalBookValueSecuritiesAmt>37867727</TotalBookValueSecuritiesAmt>
      <FootnoteTextInd>X</FootnoteTextInd>
      <TotalRevEtcAuditedFinclStmtAmt>12214230</TotalRevEtcAuditedFinclStmtAmt>
      <NetUnrealizedGainsInvstAmt>6488822</NetUnrealizedGainsInvstAmt>
      <OtherRevenueAmt>19500</OtherRevenueAmt>
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      <RevenueNotReportedFinclStmtAmt>291378</RevenueNotReportedFinclStmtAmt>
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      <ExpensesNotReportedAmt>0</ExpensesNotReportedAmt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART III, LINE 1A:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE COLLECTIONS WHICH WERE ACQUIRED THROUGH PURCHASES AND CONTRIBUTIONS SINCE THE ATHENAEUM'S INCEPTION ARE NOT RECOGNIZED AS ASSETS ON THE STATEMENT OF FINANCIAL POSITION. PURCHASES OF COLLECTION ITEMS ARE RECORDED AS DECREASES IN UNRESTRICTED NET ASSETS IN THE YEAR IN WHICH THE ITEMS ARE ACQUIRED OR AS RELEASES OF TEMPORARILY OR PERMANENTLY RESTRICTED NET ASSETS IF THE ASSETS USED TO PURCHASE THE ITEMS WERE RESTRICTED BY DONORS. CONTRIBUTED COLLECTION ITEMS ARE NO REFLECTED IN THE FINANCIAL STATEMENTS. PROCEEDS FROM DE-ACCESSIONS OR INSURANCE RECOVERIES ARE REFLECTED AS INCREASES IN THE APPROPRIATE NET ASSET CLASSES. THE ATHENAEUM'S COLLECTIONS ARE MADE UP OF BOOKS, ARTIFACTS OF HISTORICAL SIGNIFICANCE AND ART OBJECTS THAT ARE HELD FOR EDUCATIONAL, RESEARCH, SCIENTIFIC AND CURATORIAL PURPOSES. EACH OF THE ITEMS IS CATALOGED, PRESERVED AND CARED FOR, AND ACTIVITIES VERIFYING THEIR EXISTENCE AND ACCESSING THEIR CONDITION ARE PERFORMED CONTINUOUSLY.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART III, LINE 4:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ATHENAEUM'S COLLECTIONS COMPRISE OVER HALF A MILLION VOLUMES, EXTENSIVE HOLDINGS OF PAINTINGS, SCULPTURES, PRINTS, AND PHOTOGRAPHS. PARTICULAR STRENGTHS ARE IN BOSTON HISTORY, NEW ENGLAND STATE AND LOCAL HISTORY, BIOGRAPHY, ENGLISH AND AMERICAN LITERATURE, AND THE FINE AND DECORATIVE ARTS. THE ATHENAEUM SUPPORTS A DYNAMIC EXHIBITION PROGRAM AND SPONSORS A LIVELY VARIETY OF EVENTS SUCH AS LECTURES AND CONCERTS. IT ALSO SERVES AS A STIMULATING CENTER FOR DISCUSSIONS AMONG SCHOLARS, BIBLIOPHILES, AND A VARIETY OF COMMUNITY-INTEREST GROUPS.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART V, LINE 4:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ATHENAEUM'S ENDOWMENT CONSISTS OF APPROXIMATELY 490 ENDOWMENT FUNDS ESTABLISHED FOR A VARIETY OF PURPOSES. ITS ENDOWMENT INCLUDES BOTH DONOR-RESTRICTED ENDOWMENT FUNDS AND FUNDS DESIGNATED BY THE BOARD TO FUNCTION AS ENDOWMENTS. NET ASSETS ASSOCIATED WITH ENDOWMENT FUNDS ARE CLASSIFIED AND REPORTED BASED ON THE EXISTENCE OR ABSENCE OF DONOR-IMPOSED OR LEGAL RESTRICTIONS. ENDOWMENT FUNDS INCLUDE INVESTED GIFTS. THE ATHENAEUM CLASSIFIES AS PERMANENTLY RESTRICTED NET ASSETS (A) THE ORIGINAL VALUE OF GIFTS DONATED TO THE PERMANENT ENDOWMENT, (B) THE ORIGINAL VALUE OF SUBSEQUENT GIFTS TO THE PERMANENT ENDOWMENT, AND (C) ACCUMULATIONS TO THE PERMANENT ENDOWMENT MADE IN ACCORDANCE WITH THE DIRECTION OF THE APPLICABLE DONOR GIFT INSTRUMENT AT THE TIME THE ACCUMULATION IS ADDED TO THE FUND. THE REMAINING PORTION OF THE DONOR-RESTRICTED ENDOWMENT FUND THAT IS NOT CLASSIFIED IN PERMANENTLY RESTRICTED NET ASSETS IS CLASSIFIED AS TEMPORARILY RESTRICTED NET ASSETS UNTIL THOSE AMOUNTS ARE APPROPRIATED FOR EXPENDITURE BY THE ATHENAEUM IN A MANNER CONSISTENT WITH THE STANDARD OF PRUDENCE PRESCRIBED BY STATE LAW.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART X, LINE 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ATHENAEUM ACCOUNTS FOR THE EFFECT OF ANY UNCERTAIN TAX POSITIONS BASED ON A "MORE LIKELY THAN NOT" THRESHOLD TO THE RECOGNITION OF THE TAX POSITIONS BEING SUSTAINED BASED ON THE TECHNICAL MERITS OF THE POSITION UNDER SCRUTINY BY THE APPLICABLE TAXING AUTHORITY. IF A TAX POSITION OR POSITIONS ARE DEEMED TO RESULT IN UNCERTAINTIES OF THOSE POSITIONS, THE UNRECOGNIZED TAX BENEFIT IS ESTIMATED BASED ON A "CUMULATIVE PROBABILITY ASSESSMENT" THAT AGGREGATES THE ESTIMATED TAX LIABILITY FOR ALL UNCERTAIN TAX POSITIONS. THE ATHENAEUM HAS IDENTIFIED ITS TAX STATUS AS A TAX-EXEMPT ENTITY AND ITS DETERMINATION OF WHICH ACTIVITIES ARE RELATED AND UNRELATED AS ITS ONLY SIGNIFICANT TAX POSITIONS; HOWEVER, THE ATHENAEUM HAS DETERMINED THAT SUCH TAX POSITIONS DO NOT RESULT IN AN UNCERTAINTY REQUIRING RECOGNITION. THE ATHENAEUM IS NOT CURRENTLY UNDER EXAMINATION BY ANY TAXING JURISDICTION. THE ATHENAEUM'S FEDERAL AND STATE TAX RETURNS ARE GENERALLY OPEN FOR EXAMINATION FOR THREE YEARS FOLLOWING THE DATE FILED.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART XI, LINE 2D - OTHER ADJUSTMENTS:</FormAndLineReferenceDesc>
        <ExplanationTxt>REPURCHASES OF BOSTON ATHENAEUM PROPRIETOR SHARES, NET 19,500.</ExplanationTxt>
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        <TypeOfActivitiesConductedTxt>INVESTMENTS</TypeOfActivitiesConductedTxt>
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          <BusinessNameLine1>MASSACHUSETTS HISTORICAL SOCIETY</BusinessNameLine1>
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          <AddressLine1>1154 BOYLSTON STREET</AddressLine1>
          <City>BOSTON</City>
          <State>MA</State>
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        <PurposeOfGrantTxt>NEW ENGLAND REGIONAL FELLOWSHIP CONSORTIUM FUND</PurposeOfGrantTxt>
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        <FormAndLineReferenceDesc>PART I, LINE 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>SHORT-TERM RESEARCH FELLOWSHIPS, THE RESEACHERS WORK CLOSELY WITH THE REFERENCE LIBRARIANS AND AT THE END OF THEIR TERM PROVIDE A TALK TO THE ATHENAEUM COMMUNITY ON THEIR RESEARCH CONDUCTED AT THE ATHENAEUM.</ExplanationTxt>
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        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
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        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
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          <PersonNm>CAMBRIDGE ASSOCIATES</PersonNm>
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        <RelationshipDescriptionTxt>SEE BELOW</RelationshipDescriptionTxt>
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        <TransactionDesc>SEE BELOW</TransactionDesc>
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        <FormAndLineReferenceDesc>SCH L, PART IV, BUSINESS TRANSACTIONS INVOLVING INTERESTED PERSONS:</FormAndLineReferenceDesc>
        <ExplanationTxt>(B) RELATIONSHIP BETWEEN INTERESTED PERSON AND ORGANIZATION: ENTITY IN WHICH DAVID INGRAM, MEMBER OF THE BOARD, IS MANAGING DIRECTOR.(D) DESCRIPTION OF TRANSACTION: PAYMENT FOR SERVICES AS AN INVESTMENT CONSULTANT.</ExplanationTxt>
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        <ContributionCnt>8</ContributionCnt>
        <NoncashContributionsRptF990Amt>121930</NoncashContributionsRptF990Amt>
        <MethodOfDeterminingRevenuesTxt>FMV</MethodOfDeterminingRevenuesTxt>
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      <AnyPropertyThatMustBeHeldInd>0</AnyPropertyThatMustBeHeldInd>
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    <IRS990ScheduleO documentId="RetDoc1044400001">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART I &amp; III, LINE 1:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE MISSION OF THE BOSTON ATHENAEUM IS TO SERVE ITS MEMBERS, THE BROADER COMMUNITY, AND SCHOLARS THROUGHOUT THE WORLD BY PRESERVING AND AUGMENTING ITS COLLECTION OF BOOKS AND ART, BY PROVIDING LIBRARY SERVICES AND CULTURAL PROGRAMS, AND BY PRESERVING AND ENHANCING THE UNIQUE ATMOSPHERE OF ITS LANDMARK BUILDING.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 6</FormAndLineReferenceDesc>
        <ExplanationTxt>PLEASE REFER TO THE RESPONSE TO FORM 990, PART VI, SECTION A, LINE 7A BELOW.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 7A</FormAndLineReferenceDesc>
        <ExplanationTxt>THE BOSTON ATHENAEUM WAS INCORPORATED AS A SHAREHOLDER ORGANIZATION BY THE MASSACHUSETTS GENERAL COURT (THE STATE LEGISLATURE) IN 1807. ATHENAEUM SHAREHOLDERS ARE TERMED "PROPRIETORS." THE GENERAL COURT HAS AUTHORIZED 1,049 ATHENAEUM PROPRIETORS. THESE PROPRIETORS' SOLE FUNCTION IS TO ELECT THE OFFICERS AND GOVERNING BOARD OF THE ATHENAEUM. THE OFFICERS AND GOVERNING BOARD ARE REQUIRED TO ALSO BE PROPRIETORS. PROPRIETOR SHARES MAY BE BOUGHT OR SOLD, GIVEN OR BEQUEATHED. THE PROPRIETORS THEMSELVES HAVE NO CLAIM ON THE NET ASSETS OF THE ATHENAEUM, NOR DO THEY RECEIVE ANY PERSONAL FINANCIAL BENEFIT RESULTING FROM THEIR HOLDING OF THE PROPRIETORSHIP.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 11</FormAndLineReferenceDesc>
        <ExplanationTxt>PRIOR TO FILING FORM 990, DRAFT COPIES WERE DISTRIBUTED TO THE BOARD OF TRUSTEES. THE DRAFT COPY WAS ALSO REVIEWED AND DISCUSSED AT A MEETING OF THE AUDIT COMMITTEE.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 12C</FormAndLineReferenceDesc>
        <ExplanationTxt>THE TRUSTEES ADOPTED A CONFLICT OF INTEREST POLICY IN 2007. THE POLICY WAS EXPANDED IN 2010 TO INCLUDE KEY EMPLOYEES. THE EXPANDED POLICY REQUIRES AN ANNUAL WRITTEN DISCLOSURE DOCUMENT TO BE SIGNED BY EACH COVERED INDIVIDUAL. THE POLICY REQUIRES THIS PROCESS TO BE COMPLETED BY THE FIRST TRUSTEES MEETING FOLLOWING THE ANNUAL MEETING, WHICH TAKES PLACE IN FEBRUARY.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 15</FormAndLineReferenceDesc>
        <ExplanationTxt>EACH YEAR THE TRUSTEES EVALUATE THE COMPENSATION OF THE EXECUTIVE DIRECTOR OBJECTIVELY, TAKING INTO ACCOUNT COMPENSATION PAID BY SIMILAR ORGANIZATIONS FOR FUNCTIONALLY COMPARABLE POSITIONS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION C, LINE 19</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ATHENAEUM WAS INCORPORATED IN 1807. UPON THE ENACTMENT OF THE FEDERAL INCOME TAX IN THE 20TH CENTURY, THE IRS DETERMINED THAT THE ATHENAEUM WAS EXEMPT FROM TAXATION. THIS IRS DETERMINATION OCCURRED PRIOR TO THE ESTABLISHMENT OF THE APPLICATION PROCESS THAT INCLUDES FORM 1023. CONSEQUENTLY NO FORM 1023 HAS BEEN REQUIRED BY THE IRS OR PREPARED BY THE ATHENAEUM. THE ATHENAEUM'S BYLAWS AND CONFLICT OF INTEREST POLICY ARE AVAILABLE FOR REVIEW UPON REQUEST. THE COMPLETE AUDITED FINANCIAL STATEMENTS ARE INCORPORATED IN THE ATHENAEUM'S ANNUAL REPORT, WHICH IS AVAILABLE ON THE ATHENAEUM'S WEBSITE: HTTP://WWW.BOSTONATHENAEUM.ORG. THE FORM 990 AND AUDITED FINANCIAL STATEMENTS ARE ALSO AVAILABLE VIA THE MASSACHUSETTS ATTORNEY GENERAL'S WEBSITE.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART XI, LINE 9:</FormAndLineReferenceDesc>
        <ExplanationTxt>REPURCHASES OF BOSTON ATHENAEUM PROPRIETOR SHARES, NET 19,500.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
    <IRS990ScheduleR documentId="RetDoc1043400001">
      <IdRelatedTaxExemptOrgGrp>
        <DisregardedEntityName>
          <BusinessNameLine1>THE BOSTON LIBRARY SOCIETY</BusinessNameLine1>
        </DisregardedEntityName>
        <USAddress>
          <AddressLine1>10 1/2 BEACON STREET</AddressLine1>
          <City>BOSTON</City>
          <State>MA</State>
          <ZIPCode>02108</ZIPCode>
        </USAddress>
        <EIN>041105450</EIN>
        <PrimaryActivitiesTxt>ORGANIZATION THAT ALLOCATES FUNDS TO THE BOSTON ATHENAEUM</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>MA</LegalDomicileStateCd>
        <ExemptCodeSectionTxt>501(C)(3)</ExemptCodeSectionTxt>
        <PublicCharityStatusTxt>LINE 11A, I</PublicCharityStatusTxt>
        <DirectControllingNACd>N/A</DirectControllingNACd>
        <ControlledOrganizationInd>1</ControlledOrganizationInd>
      </IdRelatedTaxExemptOrgGrp>
      <IdRelatedOrgTxblCorpTrGrp>
        <RelatedOrganizationName>
          <BusinessNameLine1>CHARITABLE REMAINDER TRUST (1)</BusinessNameLine1>
        </RelatedOrganizationName>
        <PrimaryActivitiesTxt>TRUST</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>MA</LegalDomicileStateCd>
        <DirectControllingNACd>N/A</DirectControllingNACd>
        <EntityTypeTxt>T</EntityTypeTxt>
        <OwnershipPct>1.00000</OwnershipPct>
        <ControlledOrganizationInd>0</ControlledOrganizationInd>
      </IdRelatedOrgTxblCorpTrGrp>
      <ReceiptOfIntAnntsRntsRyltsInd>0</ReceiptOfIntAnntsRntsRyltsInd>
      <GiftGrntOrCapContriToOthOrgInd>0</GiftGrntOrCapContriToOthOrgInd>
      <GiftGrntCapContriFromOthOrgInd>1</GiftGrntCapContriFromOthOrgInd>
      <LoansOrGuaranteesToOtherOrgInd>0</LoansOrGuaranteesToOtherOrgInd>
      <LoansOrGuaranteesFromOthOrgInd>0</LoansOrGuaranteesFromOthOrgInd>
      <DivRelatedOrganizationInd>0</DivRelatedOrganizationInd>
      <AssetSaleToOtherOrgInd>0</AssetSaleToOtherOrgInd>
      <AssetPurchaseFromOtherOrgInd>0</AssetPurchaseFromOtherOrgInd>
      <AssetExchangeInd>0</AssetExchangeInd>
      <RentalOfFacilitiesToOthOrgInd>0</RentalOfFacilitiesToOthOrgInd>
      <RentalOfFcltsFromOthOrgInd>0</RentalOfFcltsFromOthOrgInd>
      <PerformOfServicesForOthOrgInd>0</PerformOfServicesForOthOrgInd>
      <PerformOfServicesByOtherOrgInd>0</PerformOfServicesByOtherOrgInd>
      <SharingOfFacilitiesInd>0</SharingOfFacilitiesInd>
      <PaidEmployeesSharingInd>0</PaidEmployeesSharingInd>
      <ReimbursementPaidToOtherOrgInd>0</ReimbursementPaidToOtherOrgInd>
      <ReimbursementPaidByOtherOrgInd>0</ReimbursementPaidByOtherOrgInd>
      <TransferToOtherOrgInd>0</TransferToOtherOrgInd>
      <TransferFromOtherOrgInd>0</TransferFromOtherOrgInd>
    </IRS990ScheduleR>
  </ReturnData>
</Return>