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        <InvestmentEarningsOrLossesAmt>1918715</InvestmentEarningsOrLossesAmt>
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        <OtherCostOrOtherBasisAmt>0</OtherCostOrOtherBasisAmt>
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        <Desc>DUE TO THE CITY OF BOSTON</Desc>
        <Amt>319559</Amt>
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      <TotalRevEtcAuditedFinclStmtAmt>12593477</TotalRevEtcAuditedFinclStmtAmt>
      <NetUnrealizedGainsInvstAmt>793556</NetUnrealizedGainsInvstAmt>
      <DonatedServicesAndUseFcltsAmt>0</DonatedServicesAndUseFcltsAmt>
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        <FormAndLineReferenceDesc>Schedule D, Part III, Line 1</FormAndLineReferenceDesc>
        <ExplanationTxt>EXPLANATION: TERMS FOR NOT REPORTING ASSETS PER SFAS 116 -THE LIBRARY MAINTAINS COLLECTIONS INCLUDING ARTWORK, RARE BOOK COLLECTIONS AND HISTORICAL TREASURES THAT HAVE BEEN PURCHASED OR DONATED. THESE ITEMS ARE PRESERVED AND CARED FOR AND MANY ARE DISPLAYED IN PUBLIC EXHIBITIONS. THE LIBRARY DOES NOT HAVE A FORMAL POLICY THAT REQUIRES PROCEEDS FROM THE SALE OF THESE ITEMS TO BE USED TO EXPAND THE COLLECTIONS THROUGH ADDITIONAL ACQUISITIONS. HOWEVER, HISTORICALLY, THE LIBRARY HAS NOT SOLD WORKS OF ARTS AND HISTORICAL TREASURES. AS OF JUNE 30, 2019, THE LIBRARY HAD NO INTENTION TO SELL COLLECTIONS OR USE PROCEEDS TO RESTORE CURRENT HOLDINGS OR EXPAND THE COLLECTION THROUGH ADDITIONAL ACQUISITIONS-----IN ADDITION-FORM 990 SCHEDULE D, PART XIII-EXPLANATION: PART XIII SUPPLEMENTAL FINANCIAL INFORMATION THE LIBRARY IS A PUBLIC ENTITY AND THEREFORE DOES NOT FOLLOW FASB PRONOUNCEMENTS ISSUED AFTER NOVEMBER 30, 1989</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Schedule D, Part III, Line 4</FormAndLineReferenceDesc>
        <ExplanationTxt>LIBRARY BOASTS OVER ONE MILLION RARE BOOKS AND MANUSCRIPTS, A WEALTH OF MAP, MUSICAL SCORES AND PRINTS. AMONG ITS LARGE COLLECTIONS, THE LIBRARY HOLDS SEVERAL FIRST EDITION FOLIOS BY WILLIAM SHAKESPEARE, ORIGINAL MUSIC FROM MOZART TO PROKOFIEV'S "PETER AND THE WOLF", AND IN ITS RARE BOOK COLLECTIONS THE PERSONAL LIBRARY OF JOHN ADAMS. DUE TO THE EXTENT OF THE COLLECTIONS, MANY ITEMS ARE DISPLAYED ON A ROTATING BASIS. THESE UNIQUE SPECIAL EXHIBITS ARE SHOWN IN THE RESEARCH LIBRARY AND OFFER THE PUBLIC AN OPPORTUNITY TO VIEW BOOKS AND SPECIAL DOCUMENTS WHICH ARE USUALLY ONLY ACCESSIBLE TO REGISTERED READERS IN THE RARE BOOKS READING ROOM.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Schedule D, Part V, Line 1c</FormAndLineReferenceDesc>
        <ExplanationTxt>ITEM '1C' LABELED NET INVESTMENTS EARNINGS, GAINS, AND LOSSES SHOWS ACTUAL INCREASE IN INVESTMENTS FOR CURRENT AND ALL PRIOR YEARS LISTED HERE.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Schedule D, Part V, Line 1d</FormAndLineReferenceDesc>
        <ExplanationTxt>ITEM '1D' LABELED GRANTS OR SCHOLARSHIPS SHOWS 5% DISTRIBUTION WITHDRAWN FROM THE ENDOWMENT FUNDS FOR CURRENT AND ALL PRIOR YEARS LISTED HERE.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Schedule D, Part V, Line 1e</FormAndLineReferenceDesc>
        <ExplanationTxt>ITEM '1E' LABELED OTHER EXPENDITURES FOR FACILITIES AND PROGRAMS SHOWS DISTRIBUTION TO TRINITY CHURCH IN THE CITY OF BOSTON FOR CURRENT AND ALL PRIOR YEARS LISTED HERE.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Schedule D, Part V, Line 1f</FormAndLineReferenceDesc>
        <ExplanationTxt>ITEM '1F' LABELED ADMINISTRATIVE EXPENSES SHOWS ACTUAL EXPENSES FOR CURRENT AND ALL PRIOR YEARS LISTED HERE.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Schedule D, Part V, Line 4</FormAndLineReferenceDesc>
        <ExplanationTxt>ENDOWMENT FUNDS ARE USED TO SUPPORT THE ACTIVITIES AND PROGRAMS OF THE PUBLIC LIBRARY OF THE CITY OF BOSTON.</ExplanationTxt>
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      <FundraisingEventInformationGrp>
        <Event1Nm>Boston Marathon Teams</Event1Nm>
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        <GrossRevenueEvent1Amt>140198</GrossRevenueEvent1Amt>
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        <EntertainmentOtherEventsAmt>0</EntertainmentOtherEventsAmt>
        <GrossReceiptsTotalAmt>140198</GrossReceiptsTotalAmt>
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        <FoodAndBeverageTotalEventsAmt>0</FoodAndBeverageTotalEventsAmt>
        <EntertainmentTotalEventsAmt>0</EntertainmentTotalEventsAmt>
        <OthDirectExpnssTotalEventsAmt>23364</OthDirectExpnssTotalEventsAmt>
        <DirectExpenseSummaryEventsAmt>23364</DirectExpenseSummaryEventsAmt>
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        <PersonNm>DAVID J LEONARD</PersonNm>
        <TitleTxt>President</TitleTxt>
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        <CompensationBasedOnRltdOrgsAmt>193654</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>17498</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
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        <DeferredCompensationFlngOrgAmt>0</DeferredCompensationFlngOrgAmt>
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        <TotalCompensationFilingOrgAmt>0</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>239512</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>MICHAEL R COLFORD</PersonNm>
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        <CompensationBasedOnRltdOrgsAmt>148310</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
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        <TotalCompensationRltdOrgsAmt>171520</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>LAURA S IRMSCHER</PersonNm>
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        <CompensationBasedOnRltdOrgsAmt>118885</CompensationBasedOnRltdOrgsAmt>
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        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
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        <DeferredCompRltdOrgsAmt>11889</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>0</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>23115</NontaxableBenefitsRltdOrgsAmt>
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        <TotalCompensationRltdOrgsAmt>153889</TotalCompensationRltdOrgsAmt>
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        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>ELLEN DONAGHEY</PersonNm>
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        <PersonNm>EAMON SHELTON</PersonNm>
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        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>SEAN MONAHAN</PersonNm>
        <TitleTxt>Supervisor Of Accounting Services</TitleTxt>
        <BaseCompensationFilingOrgAmt>0</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>122075</CompensationBasedOnRltdOrgsAmt>
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        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
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        <DeferredCompensationFlngOrgAmt>0</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>10987</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>0</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>21712</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>0</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>154774</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Schedule J, Part I, Line 3</FormAndLineReferenceDesc>
        <ExplanationTxt>THE COMPENSATION FOR CEO/EXECUTIVE DIRECTORS IS SET BY THE CITY OF BOSTON'S HUMAN RESOURCES DEPARTMENT.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleJ>
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      <OtherNonCashContriTableGrp>
        <NonCashCheckboxInd>X</NonCashCheckboxInd>
        <Desc>Boston Red Sox Tickets</Desc>
        <ContributionCnt>1600</ContributionCnt>
        <NoncashContributionsRptF990Amt>0</NoncashContributionsRptF990Amt>
        <MethodOfDeterminingRevenuesTxt>Fair Market Value(See note)</MethodOfDeterminingRevenuesTxt>
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      <Form8283ReceivedCnt>0</Form8283ReceivedCnt>
      <AnyPropertyThatMustBeHeldInd>0</AnyPropertyThatMustBeHeldInd>
      <ReviewProcessUnusualNCGiftsInd>1</ReviewProcessUnusualNCGiftsInd>
      <ThirdPartiesUsedInd>1</ThirdPartiesUsedInd>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Schedule M, Part I, Line 32b</FormAndLineReferenceDesc>
        <ExplanationTxt>The Fund For The Boston Public Library is a related organization to the Boston Public Library with the main purpose to solicit/raise funds for the Boston Public Library.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Schedule M, Part I, Line 33</FormAndLineReferenceDesc>
        <ExplanationTxt>The Boston Red Sox donated to the Boston Public Library 1,600 game tickets with an estimated fair market value of $87,964.This was not reported on the audited financial statements, therefore column c is blank.</ExplanationTxt>
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    <IRS990ScheduleO documentId="R000008" softwareId="18007995" softwareVersionNum="v1.00">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part III, Line 2</FormAndLineReferenceDesc>
        <ExplanationTxt>CAPITAL PROJECT IMPROVEMENTS CONTINUES IN VARIOUS LOCATIONS THROUGHOUT THE SYSTEM CAUSING A FEW BRANCH LOCATIONS TO CLOSE TEMPORARILY.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part IV, Line 29</FormAndLineReferenceDesc>
        <ExplanationTxt>BEGINNING IN FY 1999 THE FEDERAL COMMUNICATIONS COMMISSION (FCC) "ERATE" PROGRAM HAS BEEN SUPPORTING THE OPERATING COSTS RELATED TO THE BOSTON PUBLIC LIBRARY'S INFORMATION TECHNOLOGY INFRASTRUCTURE. THIS MONEY IS PAID BY THE FCC DIRECTLY TO BPL VENDORS AND IS NOT INCLUDED IN THE BPL'S AUDITED FINANCIAL STATEMENTS. FOR BPL'S FISCAL YEAR 2019 $389,595.85 HAS BEEN PAID OUT TO BPL VENDORS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, Line 11b</FormAndLineReferenceDesc>
        <ExplanationTxt>A DRAFT OF FORM 990 WAS PROVIDED TO THE GOVERNING BODY FOR REVIEW BEFORE IT WAS FILED.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, Line 12c</FormAndLineReferenceDesc>
        <ExplanationTxt>ALL EMPLOYEES ARE PROVIDED A SUMMARY OF THE CONFLICT OF INTEREST LAW AND MUST SIGN AND COMPLETE AN ACKNOWLEDGEMENT OF ITS RECEIPT AT TIME OF HIRE AND ANNUALLY THEREAFTER. ALSO, WITHIN THE FIRST 30 DAYS OF HIRE AND EVERY 2 YEARS THEREAFTER THEY ARE REQUIRED TO COMPLETE AN ONLINE TRAINING PROGRAM AT HTTP://WWW.MUNIPROG.ETH.STATE.MA.US/.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, Line 15</FormAndLineReferenceDesc>
        <ExplanationTxt>THE COMPENSATION FOR OFFICERS AND KEY EMPLOYEES ARE SET BY THE CITY OF BOSTON'S HUMAN RESOURCES DEPARTMENT.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section C, Line 19</FormAndLineReferenceDesc>
        <ExplanationTxt>ALL GOVERNING DOCUMENTS AND FINANCIAL STATEMENTS ARE AVAILABLE ON THE LIBRARY'S WEBSITE: BPL.ORG. ALL POLICIES INCLUDING THE CONFLICT OF INTEREST POLICY ARE AVAILABLE ON THE CITY'S HUB WHICH ALL EMPLOYEES HAVE ACCESS TO AND THEY ARE ALSO INCLUDED ON THE CITY OF BOSTON EMPLOYEE HANDBOOK.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VIII, Line 1d</FormAndLineReferenceDesc>
        <ExplanationTxt>IN FY19 LISTED HERE AMOUNTS RECEIVED DIRECTLY FROM THE BOSTON PUBLIC LIBRARY FOUNDATION $178,385 AND FROM THE ASSOCIATES OF THE BOSTON PUBLIC LIBRARY $552,745, GRAND TOTAL $731,130. PRIOR TO FY18 THESE WERE INCLUDED ON FORM 990 PART VIII STATEMENT OF REVENUE ITEM LINE 1F "ALL OTHER CONTRIBUTIONS..."</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VIII, Line 2a - 2e</FormAndLineReferenceDesc>
        <ExplanationTxt>AMOUNT LISTED HERE $119,320 NEXT TO THE HEADING PROGRAM REVENUE IS MEMBERSHIP DUES PAID BY OTHER ORGANIZATIONS WHOSE MEMBERS/PATRONS USE THE METRO BOSTON LIBRARY NETWORK SYSTEM (MBLN).</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VIII, Line 5</FormAndLineReferenceDesc>
        <ExplanationTxt>FY19 ROYALTIES $25,215. PRIOR TO FY18 THESE $ WERE INCLUDED ON FORM 990 PART VIII STATEMENT OF REVENUE, MISCELLANEOUS REVENUE, ITEM LINE 11A "OTHER REVENUE.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part IX, Line 11g</FormAndLineReferenceDesc>
        <ExplanationTxt>CATALOGING $478,385, DIGITIZATION/PRINT DEPT $400,285, CLERICAL/OFFICE ADMIN $277,589, CONSERVATION/RESTORATION $142,399, MAINTENANCE/FACILITIES $62,434, SNOW REMOVAL $42,115, DESIGN SERVICES $11,629, LANDSCAPING $10,975, PROGRAM SERVICES $485.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
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          <BusinessNameLine1Txt>FUND FOR THE BOSTON PUBLIC LIBRARY INC</BusinessNameLine1Txt>
        </DisregardedEntityName>
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          <AddressLine1Txt>700 BOYLSTON STREET</AddressLine1Txt>
          <CityNm>BOSTON</CityNm>
          <StateAbbreviationCd>MA</StateAbbreviationCd>
          <ZIPCd>02116</ZIPCd>
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        <EIN>043150560</EIN>
        <PrimaryActivitiesTxt>SUPPORT</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>MA</LegalDomicileStateCd>
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      <IdRelatedTaxExemptOrgGrp>
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          <BusinessNameLine1Txt>ASSOCIATES OF THE BOSTON PUBLIC LIBRARY INC</BusinessNameLine1Txt>
        </DisregardedEntityName>
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          <AddressLine1Txt>700 BOYLSTON STREET</AddressLine1Txt>
          <CityNm>BOSTON</CityNm>
          <StateAbbreviationCd>MA</StateAbbreviationCd>
          <ZIPCd>02116</ZIPCd>
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        <EIN>042900822</EIN>
        <PrimaryActivitiesTxt>SUPPORT</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>MA</LegalDomicileStateCd>
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          <AddressLine1Txt>ONE CITY HALL SQUARE</AddressLine1Txt>
          <CityNm>BOSTON</CityNm>
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          <ZIPCd>02116</ZIPCd>
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        <EIN>046011380</EIN>
        <PrimaryActivitiesTxt>GOVERNMENT</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>MA</LegalDomicileStateCd>
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      <ReceiptOfIntAnntsRntsRyltsInd>0</ReceiptOfIntAnntsRntsRyltsInd>
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        <MethodOfAmountDeterminationTxt>ACTUAL $</MethodOfAmountDeterminationTxt>
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        <MethodOfAmountDeterminationTxt>FAIR MARKET VALUE</MethodOfAmountDeterminationTxt>
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      <TransactionsRelatedOrgGrp>
        <OtherOrganizationName>
          <BusinessNameLine1Txt>FUND FOR THE BOSTON PUBLIC LIBRARY INC</BusinessNameLine1Txt>
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        <MethodOfAmountDeterminationTxt>ACTUAL $</MethodOfAmountDeterminationTxt>
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          <BusinessNameLine1Txt>FUND FOR THE BOSTON PUBLIC LIBRARY INC</BusinessNameLine1Txt>
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        <MethodOfAmountDeterminationTxt>ACTUAL $</MethodOfAmountDeterminationTxt>
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          <BusinessNameLine1Txt>ASSOCIATES OF THE BOSTON PUBLIC LIBRARY INC</BusinessNameLine1Txt>
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        <MethodOfAmountDeterminationTxt>ACTUAL $</MethodOfAmountDeterminationTxt>
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      <TransactionsRelatedOrgGrp>
        <OtherOrganizationName>
          <BusinessNameLine1Txt>ASSOCIATES OF THE BOSTON PUBLIC LIBRARY INC</BusinessNameLine1Txt>
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        <TransactionTypeTxt>n</TransactionTypeTxt>
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        <MethodOfAmountDeterminationTxt>FAIR MARKET VALUE</MethodOfAmountDeterminationTxt>
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      <TransactionsRelatedOrgGrp>
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        <MethodOfAmountDeterminationTxt>ACTUAL $-See Note 1c</MethodOfAmountDeterminationTxt>
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        <FormAndLineReferenceDesc>Schedule R, Part V, Line 1c</FormAndLineReferenceDesc>
        <ExplanationTxt>Gift, Grant, or capital contribution to related organization(s)-The Boston Public Library received $178,835 from The Fund For The Boston Public Library Inc. and $552,745 from The Associates Of The Boston Public Library to support library operations. The Library operates as a separate department within the City Of Boston operations, with the City paying most of its costs. In fiscal year 2019 the Library's expenses it paid on its own totaled about $10 million and as a department of the City about $38.6 million.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Schedule R, Part V, Line 1n</FormAndLineReferenceDesc>
        <ExplanationTxt>Sharing of facilities, equipment, mailing lists, or other assets related with related organization(s)-The Boston Public Library provided free rent space to The Fund For The Boston Public Library Inc. with an estimated fair market value of $12,000 and to the Associates Of The Boston Public Library with an estimated fair market value of $6,000.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Schedule R, Part V, Line 1o</FormAndLineReferenceDesc>
        <ExplanationTxt>Sharing of paid employees with related organization(s)-The Boston Public Library paid $52,050 in salaries directly to a staff member in The Fund For The Boston Public Library Inc.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Schedule R, Part V, Line 1r</FormAndLineReferenceDesc>
        <ExplanationTxt>Other transfer of cash or property to related organization(s)-Boston Public Library reimbursed $26,000 to The Fund For The Boston Public Library Inc. for monies received that was intended for the Fund .</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleR>
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</Return>