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      <Form990PartVIISectionAGrp>
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      <Form990PartVIISectionAGrp>
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      <Form990PartVIISectionAGrp>
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      <Form990PartVIISectionAGrp>
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      <Form990PartVIISectionAGrp>
        <PersonNm>MICHAEL STANLEY</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>RICHARD WU</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>AHMED AHMED</PersonNm>
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      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>ERIC REINES</PersonNm>
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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
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      <TotReportableCompRltdOrgAmt>0</TotReportableCompRltdOrgAmt>
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      <ContractorCompensationGrp>
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          <BusinessName>
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      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
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        <ContractorAddress>
          <USAddress>
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      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1Txt>INTERIM EXECUTIVE SOLUTIONS</BusinessNameLine1Txt>
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        <ContractorAddress>
          <USAddress>
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      <ProgramServiceRevenueGrp>
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      <NetGainOrLossInvestmentsGrp>
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      <GrantsToDomesticOrgsGrp>
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      <FeesForServicesAccountingGrp>
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      <FeesForSrvcInvstMgmntFeesGrp>
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      <InformationTechnologyGrp>
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        <ProgramServicesAmt>1816</ProgramServicesAmt>
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      <OccupancyGrp>
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        <ProgramServicesAmt>60929</ProgramServicesAmt>
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      <TravelGrp>
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        <ProgramServicesAmt>5460</ProgramServicesAmt>
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      <ConferencesMeetingsGrp>
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        <ProgramServicesAmt>6899</ProgramServicesAmt>
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        <ProgramServicesAmt>2466</ProgramServicesAmt>
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        <Desc>TRANSITION COSTS</Desc>
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      <OtherExpensesGrp>
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        <ProgramServicesAmt>255</ProgramServicesAmt>
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      <CashNonInterestBearingGrp>
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      <TotLiabNetAssetsFundBalanceGrp>
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        <ExplanationTxt>THE ORGANIZATION CONFIRMED THE SUPPORTED ORGANIZATION'S STATUS THROUGH THE IRS BUSINESS MASTER FILE. THE ORGANIZATION CONFIRMED THAT THE SUPPORTED ORGANIZATION WOULD MEET THE SUPPORT TESTS UNDER SECTION 509(A)(2) BY CONDUCTING AN ANALYSIS OF THE SUPPORT TEST. THE ORGANIZATION DOES NOT PROVIDE GRANTS TO ITS SUPPORTED ORGANIZATION, BUT ENSURES THAT ITS FINANCIAL AND PROGRAMMATIC ACTIVITIES ARE FOR SECTION 170(C)(2) PURPOSES.</ExplanationTxt>
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      <Form990ScheduleAPartVIGrp>
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        <ExplanationTxt>BY REASON OF THE RELATIONSHIP DESCRIBED IN SECTION (2), ALL FIVE OF THE OFFICERS OF THE ORGANIZATION ARE MEMBERS OF THE SUPPORTED ORGANIZATION. MEMBERS APPOINTED BY THE SUPPORTED ORGANIZATION SIT ON THE FINANCE AND INVESTMENT COMMITTEES OF THE ORGANIZATION. FURTHERMORE, THE PRESIDENT OF THE ORGANIZATION HAS THE OPPORTUNITY EVERY YEAR TO PRESENT TO THE GOVERNING BOARD OF THE SUPPORTED ORGANIZATION REGARDING THE ORGANIZATION'S AFFAIRS. AN OFFICER OF THE SUPPORTED ORGANIZATION ALSO IS DESIGNATED AS THE CONTACT PERSON FOR THE ORGANIZATION.</ExplanationTxt>
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      <Form990ScheduleAPartVIGrp>
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      <Form990ScheduleAPartVIGrp>
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        <ExplanationTxt>THE ORGANIZATION'S MAINTENANCE AND SUPPORT OF A MEDICAL LIBRARY, ITS PRIMARY FUNCTION, DIRECTLY FURTHERS THE EXEMPT PURPOSES OF SUPPORTED ORGANIZATION, MASSACHUSETTS MEDICAL SOCIETY. THE LIBRARY IS A CRUCIAL RESOURCE TO THE SUPPORTED ORGANIZATION IN ALLOWING IT TO CARRY OUT THE PURPOSES SUPPORTED BY THE ORGANIZATION. SEE THE RESPONSE TO PART IV, SECTION D, QUESTION 3, ABOVE REGARDING RESPONSIVENESS.</ExplanationTxt>
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      <OtherLiabilitiesOrgGrp>
        <Desc>OPERATING LEASE LIABILITY</Desc>
        <Amt>186351</Amt>
      </OtherLiabilitiesOrgGrp>
      <TotalLiabilityAmt>186351</TotalLiabilityAmt>
      <FootnoteTextInd>X</FootnoteTextInd>
      <TotalRevEtcAuditedFinclStmtAmt>2514417</TotalRevEtcAuditedFinclStmtAmt>
      <NetUnrealizedGainsInvstAmt>1194684</NetUnrealizedGainsInvstAmt>
      <OtherRevenueAmt>-59798</OtherRevenueAmt>
      <RevenueNotReportedAmt>1134886</RevenueNotReportedAmt>
      <RevenueSubtotalAmt>1379531</RevenueSubtotalAmt>
      <RevenueNotReportedFinclStmtAmt>0</RevenueNotReportedFinclStmtAmt>
      <TotalRevenuePerForm990Amt>1379531</TotalRevenuePerForm990Amt>
      <TotExpnsEtcAuditedFinclStmtAmt>1258467</TotExpnsEtcAuditedFinclStmtAmt>
      <ExpensesNotReportedAmt>0</ExpensesNotReportedAmt>
      <ExpensesSubtotalAmt>1258467</ExpensesSubtotalAmt>
      <OtherExpensesNotIncludedAmt>59798</OtherExpensesNotIncludedAmt>
      <ExpensesNotRptFinclStmtAmt>59798</ExpensesNotRptFinclStmtAmt>
      <TotalExpensesPerForm990Amt>1318265</TotalExpensesPerForm990Amt>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART III, LINE 1A:</FormAndLineReferenceDesc>
        <ExplanationTxt>LITERARY PROPERTY PURCHASED OR RECEIVED AS A GIFT IS NOT CAPITALIZED. SUCH COLLECTIONS, WHICH ARE HELD FOR PUBLIC EXHIBITION OR EDUCATION, PROTECTED AND PRESERVED AND SUBJECT TO THE LIBRARY'S POLICY TO USE ANY PROCEEDS FROM SALE OF COLLECTIONS TO ACQUIRE OTHER COLLECTION ITEMS, ARE NOT RECOGNIZED AS ASSETS IN THE STATEMENTS OF FINANCIAL POSITION. NO LITERARY PROPERTY WAS PURCHASED FOR EITHER OF THE YEARS ENDED JUNE 30, 2025 OR 2024.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART III, LINE 4:</FormAndLineReferenceDesc>
        <ExplanationTxt>LITERARY COLLECTION CONSISTS OF CURRENT AND HISTORICAL MEDICAL LITERATURE, ART OBJECTS AND MEDICAL ARTIFACTS THAT WERE EITHER PURCHASED OR DONATED TO THE LIBRARY FOR PUBLIC EXHIBITION, EDUCATION AND PRESERVATION.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART V, LINE 4:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE LIBRARY'S ENDOWMENT CONSISTS OF APPROXIMATELY SEVENTY INDIVIDUAL FUNDS ESTABLISHED FOR A VARIETY OF PURPOSES. ITS ENDOWMENT INCLUDES BOTH DONOR-RESTRICTED ENDOWMENT FUNDS AND FUNDS DESIGNATED BY THE BOARD OF TRUSTEES TO FUNCTION AS ENDOWMENTS. NET ASSETS ASSOCIATED WITH ENDOWMENT FUNDS, INCLUDING FUNDS DESIGNATED BY THE BOARD OF TRUSTEES TO FUNCTION AS ENDOWMENTS, ARE CLASSIFIED AND REPORTED BASED ON THE EXISTENCE OR ABSENCE OF DONOR-IMPOSED RESTRICTIONS. SUBJECT TO THE UNIFORM PRUDENT MANAGEMENT OF INSTITUTION FUNDS ACT ("UPMIFA"), AS DESCRIBED BELOW, THE PRINCIPAL MAY BE SPENT GIVEN A GOOD-FAITH DETERMINATION THAT SUCH SPENDING IS PRUDENT. THE BOARD OF TRUSTEES OF THE LIBRARY HAS INTERPRETED THE UPMIFA AS ENACTED BY THE COMMONWEALTH OF MASSACHUSETTS EFFECTIVE JUNE 30, 2009, AS REQUIRING THE PRESERVATION OF THE ORIGINAL FAIR VALUE OF THE DONOR-RESTRICTED GIFT ABSENT EXPLICIT DONOR STIPULATIONS TO THE CONTRARY. THE SPENDING POLICY AND PHILOSOPHY, INCLUDING THE LONG TERM INVESTMENT MANAGEMENT POLICIES AND PROCEDURES, WERE DESIGNED TO FUNCTION AS INTEGRATED PROCESSES AND ARE ADMINISTERED TO REFLECT THE FOLLOWING FACTORS, AS DESCRIBED IN UPMIFA, FOR PRUDENT STEWARDS OF ASSETS: - THE DURATION AND PRESERVATION OF A FUND; - THE PURPOSE OF THE ORGANIZATION AND THE DONOR DESIGNATIONS THERETO; - GENERAL ECONOMIC CONDITIONS; - THE POSSIBLE EFFECTS OF INFLATION AND DEFLATION; - THE EXPECTED TOTAL RETURN OF THE CHARITABLE ASSETS; - OTHER RESOURCES OF THE ORGANIZATION; AND - THE INVESTMENT POLICIES. IN ESTABLISHING ITS SPENDING POLICY, THE LIBRARY CONSIDERED THE LONG-TERM EXPECTED RETURN ON ITS ENDOWMENT. ACCORDINGLY, THE BOARD OF TRUSTEES OF THE LIBRARY HAS TRADITIONALLY AUTHORIZED THE APPROPRIATION FOR EXPENDITURE FROM ENDOWMENT FUNDS OF UP TO THREE PERCENT OF THE RESPECTIVE FUND'S VALUE, AS DEFINED, IN ANY FISCAL YEAR. THIS IS CONSISTENT WITH THE LIBRARY'S OBJECTIVE TO MAINTAIN THE PURCHASING POWER OF THE ENDOWMENT ASSETS HELD FOR A SPECIFIED TERM AS WELL AS TO PROVIDE ADDITIONAL REAL GROWTH THROUGH NEW GIFTS AND INVESTMENT RETURN. IN ORDER TO ADDRESS FUNDING FOR INCREASED TRANSITION COSTS RELATED TO THE BOSTON MEDICAL LIBRARY'S FUTURE PLANS, EFFECTIVE JANUARY 2022, THE BOARD OF TRUSTEES VOTED TO PAUSE THE THREE PERCENT SPENDING POLICY AND ELIMINATE BOARD-DESIGNATED RESTRICTIONS. BOARD-DESIGNATED ENDOWMENT FUNDS HAVE BEEN REDESIGNATED AS UNDESIGNATED.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART X, LINE 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE LIBRARY IS EXEMPT FROM FEDERAL AND STATE INCOME TAXES UNDER SECTION 501(C)(3) OF THE INTERNAL REVENUE CODE. TAX POSITIONS, INCLUDING THE POSITION THAT THE LIBRARY QUALIFIES AS A TAX-EXEMPT ENTITY, TAKEN OR EXPECTED TO BE TAKEN IN THE COURSE OF PREPARING THE LIBRARY'S TAX RETURNS, ARE REQUIRED TO BE EVALUATED TO DETERMINE WHETHER THE TAX POSITIONS ARE "MORE-LIKELY-THAN-NOT" OF BEING SUSTAINED BY THE APPLICABLE TAX AUTHORITY. TAX POSITIONS NOT DEEMED TO MEET A MORE-LIKELY-THAN-NOT THRESHOLD WOULD BE RECORDED AS A TAX EXPENSE IN THE CURRENT YEAR. THE LIBRARY DOES NOT HAVE ANY UNCERTAIN TAX POSITIONS AT JUNE 30, 2025 OR 2024 WHICH REQUIRE ACCRUAL OR DISCLOSURE. GENERALLY, THE LIBRARY IS SUBJECT TO FEDERAL AND STATE TAX EXAMINATION BY TAX AUTHORITIES FOR ALL YEARS SUBSEQUENT TO JUNE 30, 2021. THE LIBRARY'S POLICY IS TO RECOGNIZE ANY INTEREST AND PENALTIES RELATED TO TAX MATTERS AS AN EXPENSE WHEN PAID.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART XI, LINE 2D - OTHER ADJUSTMENTS:</FormAndLineReferenceDesc>
        <ExplanationTxt>RECLASS INVESTMENT EXPENSES FROM REVENUE TO EXPENSE -59,798.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART XII, LINE 4B - OTHER ADJUSTMENTS:</FormAndLineReferenceDesc>
        <ExplanationTxt>RECLASS INVESTMENT EXPENSES FROM REVENUE TO EXPENSE 59,798.</ExplanationTxt>
      </SupplementalInformationDetail>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 2</FormAndLineReferenceDesc>
        <ExplanationTxt>DRS. PIETERS AND JOLIN ARE SPOUSES.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 3</FormAndLineReferenceDesc>
        <ExplanationTxt>BOSTON MEDICAL LIBRARY DELEGATES CONTROL OVER ITS ACCOUNTING FUNCTION TO DAVID M. PINKHAM, CPA, LLC. THE ORGANIZATION'S ACCOUNTING EXPENSES FOR THE YEAR WERE $74,154</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 7A</FormAndLineReferenceDesc>
        <ExplanationTxt>MASSACHUSETTS MEDICAL SOCIETY, THE BOSTON MEDICAL LIBARARY (BML)'S SUPPORTED ORGANIZATION, APPOINTS 11 OF THE 23 MEMBERS OF THE BML BOARD OF TRUSTEES</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 11B</FormAndLineReferenceDesc>
        <ExplanationTxt>THE FORM 990 WILL BE REVIEWED BY BOSTON MEDICAL LIBRARY'S PRESIDENT AND TREASURER PRIOR TO BEING FILED. THE 990 IS PROVIDED TO ALL BOARD MEMBER TO REVIEW BEFORE FILING.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 12C</FormAndLineReferenceDesc>
        <ExplanationTxt>THE CORPORATION MAY ENTER INTO CONTRACTS OR TRANSACTIONS WITH AN OFFICER, TRUSTEE OR FELLOW OR WITH ANY CORPORATION OR OTHER CONCERN IN WHICH AN OFFICER, TRUSTEE OR FELLOW IS A STOCKHOLDER, PARTNER DIRECTOR, OFFICER OR EMPLOYEE OR IS OTHERWISE INTERESTED. IN THE ABSENCE OF FRAUD OR BAD FAITH, NO SUCH CONTRACT OR TRANSACTION SHALL BE INVALIDATED OR AFFECTED BY THE FACT THAT THE PRESENCE OF SUCH INTERESTED PERSON WAS NECESSARY TO CONSTITUTE A QUORUM AT A MEETING OF THE BOARD OF TRUSTEES (OR ANY AUTHORIZED COMMITTEE THEREOF) AT WHICH SUCH CONTRACT OR TRANSACTION WAS AUTHORIZED OR THAT THE VOTE OF SUCH INTERESTED PERSON WAS NECESSARY FOR THE ADOPTION OF SUCH CONTRACT OR TRANSACTION, PROVIDED THAT IF SUCH INTEREST WAS MATERIAL, IT SHALL HAVE BEEN DISCLOSED TO THE TRUSTEES OR FELLOWS VOTING ON SUCH CONTRACT OR TRANSACTION. A GENERAL NOTICE TO ANY PERSON VOTING ON SUCH CONTRACT OR TRANSACTION THAT AN OFFICER, TRUSTEE OR FELLOW HAS A MATERIAL INTEREST IN ANY CORPORATION OR OTHER CONCERN SHALL BE SUFFICIENT DISCLOSURE AS TO SUCH OFFICER, TRUSTEE OR FELLOW WITH RESPECT TO ALL CONTRACTS AND TRANSACTIONS WITH SUCH CORPORATION OR OTHER CONCERN. MORE INFORMATION IS AVAILABLE UPON REQUEST. THE BOARD ADOPTED A CONFLICT OF INTEREST POLICY THAT INCLUDES ANNUAL REVIEW OF THE AFFIDAVITS SIGNED BY ALL TRUSTEES &amp; OFFICERS &amp; IF CONFLICTS EXIST THE BOARD WILL DEAL WITH THEM ACCORDINGLY.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 15</FormAndLineReferenceDesc>
        <ExplanationTxt>BML HAD THREE EMPLOYEES IN FY2025. BML ALSO REIMBURSED THE PERSONNEL SERVICES PROVIDED BY HARVARD DURING THE TAX YEAR.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION C, LINE 19</FormAndLineReferenceDesc>
        <ExplanationTxt>GOVERNING DOCUMENTS AND THE CONFLICTS OF INTEREST POLICY ARE AVAILABLE UPON REQUEST. THE FORM 990 IS AVAILABLE UPON REQUEST FOR A NOMINAL FEE CHARGED FOR REPRODUCTION AND POSTAGE.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART XII, LINE 2C</FormAndLineReferenceDesc>
        <ExplanationTxt>THERE WAS NO CHANGE IN THE OVERSIGHT PROCESS OR SELECTION PROCESS DURING THE TAX YEAR.</ExplanationTxt>
      </SupplementalInformationDetail>
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          <BusinessNameLine1Txt>MASSACHUSETTS MEDICAL SOCIETY</BusinessNameLine1Txt>
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          <AddressLine1Txt>860 WINTER STREET</AddressLine1Txt>
          <CityNm>WALTHAM</CityNm>
          <StateAbbreviationCd>MA</StateAbbreviationCd>
          <ZIPCd>02451</ZIPCd>
        </USAddress>
        <EIN>042050773</EIN>
        <PrimaryActivitiesTxt>ASSOCIATION</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>MA</LegalDomicileStateCd>
        <ExemptCodeSectionTxt>501(C)(6)</ExemptCodeSectionTxt>
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        </DirectControllingEntityName>
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      <GiftGrntCapContriFromOthOrgInd>1</GiftGrntCapContriFromOthOrgInd>
      <LoansOrGuaranteesToOtherOrgInd>0</LoansOrGuaranteesToOtherOrgInd>
      <LoansOrGuaranteesFromOthOrgInd>0</LoansOrGuaranteesFromOthOrgInd>
      <DivRelatedOrganizationInd>0</DivRelatedOrganizationInd>
      <AssetSaleToOtherOrgInd>0</AssetSaleToOtherOrgInd>
      <AssetPurchaseFromOtherOrgInd>0</AssetPurchaseFromOtherOrgInd>
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      <RentalOfFacilitiesToOthOrgInd>0</RentalOfFacilitiesToOthOrgInd>
      <RentalOfFcltsFromOthOrgInd>0</RentalOfFcltsFromOthOrgInd>
      <PerformOfServicesForOthOrgInd>0</PerformOfServicesForOthOrgInd>
      <PerformOfServicesByOtherOrgInd>0</PerformOfServicesByOtherOrgInd>
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      <PaidEmployeesSharingInd>0</PaidEmployeesSharingInd>
      <ReimbursementPaidToOtherOrgInd>0</ReimbursementPaidToOtherOrgInd>
      <ReimbursementPaidByOtherOrgInd>0</ReimbursementPaidByOtherOrgInd>
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          <BusinessNameLine1Txt>MASSACHUSETTS MEDICAL SOCIETY</BusinessNameLine1Txt>
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