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      <TotalRevEtcAuditedFinclStmtAmt>11236740</TotalRevEtcAuditedFinclStmtAmt>
      <NetUnrealizedGainsInvstAmt>-2926612</NetUnrealizedGainsInvstAmt>
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      <RevenueSubtotalAmt>14163352</RevenueSubtotalAmt>
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      <RevenueNotReportedFinclStmtAmt>0</RevenueNotReportedFinclStmtAmt>
      <TotalRevenuePerForm990Amt>14163352</TotalRevenuePerForm990Amt>
      <TotExpnsEtcAuditedFinclStmtAmt>8748023</TotExpnsEtcAuditedFinclStmtAmt>
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      <ExpensesSubtotalAmt>8748023</ExpensesSubtotalAmt>
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      <SupplementalInformationDetail>
        <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 COLLECTION BOOKS 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, 2018, THE LIBRARY HAD NO INTENTION TO SELL COLLECTIONS OR USE PROCEEDS TO RESTORE CURRENT HOLDINGS OR EXPAND THE COLLECTION THROUGH ADDITIONAL ACQUISITIONS-----IN ADDITON-FORM 990 SCHEDUDE D, PART XIII-EXPLANATION: PART XIII SUPPLIMENTAL FINANCIAL INFORMATION THE LIBRARY IS A PUBLIC ENTITY AND THEREFORE DOES NOT FOLLOW FASB PRONOUNCEMENTS ISSUED AFTER NOVEMBER 30, 1989.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Schedule D, Part III, Line 4</FormAndLineReferenceDesc>
        <ExplanationTxt>THE 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>
      </SupplementalInformationDetail>
      <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>
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      <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>
      </SupplementalInformationDetail>
      <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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    </IRS990ScheduleD>
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      <InitialContractExceptionInd>0</InitialContractExceptionInd>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>DAVID J LEONARD</PersonNm>
        <TitleTxt>President</TitleTxt>
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        <CompensationBasedOnRltdOrgsAmt>193654</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>17000</BonusRelatedOrganizationsAmt>
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        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
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        <NontaxableBenefitsRltdOrgsAmt>9123</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>0</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>238736</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>MICHAEL R COLFORD</PersonNm>
        <TitleTxt>Director Of Library Services</TitleTxt>
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        <CompensationBasedOnRltdOrgsAmt>125396</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
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        <TotalCompensationFilingOrgAmt>14613</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>147456</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
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        <PersonNm>LAURA S IRMSCHER</PersonNm>
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        <TotalCompensationRltdOrgsAmt>138697</TotalCompensationRltdOrgsAmt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>JAMES P MEADE</PersonNm>
        <TitleTxt>Superintendent Of Library Buildings</TitleTxt>
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        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
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        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
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        <DeferredCompRltdOrgsAmt>11368</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>0</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>22244</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>0</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>160630</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>ELLEN DONAGHEY</PersonNm>
        <TitleTxt>Chief Financial Officer (CFO)</TitleTxt>
        <BaseCompensationFilingOrgAmt>0</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>128256</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
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        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
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        <DeferredCompensationFlngOrgAmt>0</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>11543</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>0</NontaxableBenefitsFilingOrgAmt>
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        <TotalCompensationFilingOrgAmt>0</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>153978</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
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        <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>
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    </IRS990ScheduleJ>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part III, Line 2</FormAndLineReferenceDesc>
        <ExplanationTxt>A NEW BRANCH WAS OPENED IN CHINATOWN ON FEBRUARY 2018, MARKING THE RETURN OF LIBRARY SERVICES TO THIS NEIGHBORHOOD FOR THE FIRST TIME IN MORE THAN 50 YEARS, COMPLETED THE INVENTORY OF THE PRINT DEPARTEMNT'S COLLECTION AFTER ABOUT A 3 YEAR EFFORT AND ADDED A REFERENCE LIBRARIAN SPECIALIZING IN HEALTH AND HUMAN SERVICES. CAPITAL PROJECT IMPROVEMENTS CONTINUES IN VARIOUS LOCATIONS THROUGHOUT THE SYSTEM.</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 2018 ABOUT $484,000 WAS REQUESTED IN FUNDING FOR WHICH $73,000 HAS BEEN PAID OUT TO BPL VENDORS SO FAR. FROM THE TOTAL AMOUNT REQUESTED, $356,000 IS PENDING COMMITMENT APPROVAL AS OF 1-8-19.</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 FY18 LISTED HERE AMOUNTS RECEIVED DIRECTLY FROM THE BOSTON PUBLIC LIBRARY FOUNDATION $245,719 AND FROM THE ASSOCIATES OF THE BOSTON PUBLIC LIBRARY $409,565, GRAND TOTAL $655,284. IN PRIOR YEARS 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 $126,329 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>IN FY18 LISTED HERE AMOUNTS RECEIVED FOR ROYALTIES $18,750. IN PRIOR YEARS 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 $298,776, CLERICAL/OFFICE ADMIN $167,457, CONSERVATION/RESTORATION $220,080, DESIGN SERVICES $6,875, DIGITIZATION SERVICES $480,648, LANDSCAPING $17,931, MAINTENANCE/FACILITIES $3,652, PRINT DEPARTMENT CATALOGING $117,835, PROGRAM SERVICES $4,979, SNOW REMOVAL $53,275.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Schedule B, Part I</FormAndLineReferenceDesc>
        <ExplanationTxt>FOR ANONYMOUS DONATIONS THE ADDRESS LISTED FOR THEM IS 700 BOYLSTON STREET, BOSTON, MA 02116 BECAUSE THEY CANNOT BE LEFT BLANK. THIS IS THE ADDRESS OF THE TRUSTEES OF THE PUBLIC LIBRARY OF THE CITY OF BOSTON.</ExplanationTxt>
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        <MethodOfAmountDeterminationTxt>THE BOSTON PUBLIC LIBRARY IS PAYING THE SALARY FOR A STAFF MEMBER IN THE BOSTON PUBLIC LIBRARY FOUNDATION.</MethodOfAmountDeterminationTxt>
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