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        <FormAndLineReferenceDesc>PART II-B, LINE 1:</FormAndLineReferenceDesc>
        <ExplanationTxt>ORGANIZATION HAS CONTRACTED WITH ROSCOMMON INTERNATIONAL TO WORK WITH EXECUTIVE AND LEGISLATIVE LEADERS IN COMMONWEALTH OF PENNSYLVANIA AND CITY OF PHILADELPHIA TO GARNER SUPPORT FOR LCP PROGRAMS AND INITIATIVES</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART III, LINE 4:</FormAndLineReferenceDesc>
        <ExplanationTxt>ORGANIZATION MAINTAINS COLLECTIONS OF ART, HISTORICAL TREASURES AND OTHER SIMILAR ASSETS. THE PERMANENT COLLECTIONS COMPRISE APPROXIMATELY 500,000 BOOKS, PAMPHLETS AND BROADSIDES, 160,000 MANUSCRIPTS, 100,000 PRINTS, PHOTOGRAPHS AND OTHER GRAPHIC WORKS, AND SEVERAL HUNDRED WORKS OF ART AND ARTIFACTS BECAUSE THE VALUES OF THE EXISTING PERMANENT COLLECTIONS ARE NOT READILY DETERMINABLE, IN ACCORDANCE WITH FASB ASC 958, NOT-FOR-PROFIT ENTITIES, THE COMPANY HAS NOT CAPITALIZED THEM. ACCESSIONS AND DEACCESSIONS ARE ACCOUNTED FOR IN UNRESTRICTED NET ASSETS.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART V, LINE 4:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE LIBRARY COMPANY'S ENDOWMENT COMPRISES FUNDS RESTRICTED BY DONORS TO SUPPORT PARTICULAR ACTIVITES (E G RESEARCH, FELLOWSHIPS, ACQUISITIONS, TECNHOLOGY, CATALOGING AND MAINTENANCE) AND UNRESTRICTED FUNDS DESIGNATED BY THE BOARD OF TRUSTEES TO FUNCTION AS ENDOWMENT THAT SUPPORT ALL ASPECTS OF THE COMPANY'S OPERATIONS.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART X, LINE 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE COMPANY IS EXEMPT FROM FEDERAL INCOME TAXES UNDER SECTION 501(C)(3) OF THE INTERNAL REVENUE CODE. PURSUANT TO FASB ACCOUNTING STANDARDS CODIFICATION TOPIC 740, THE COMPANY RECOGNIZES TAX BENEFITS ONLY IF IT IS MORE LIKELY THAN NOT THAT A TAX POSITION WILL BE SUSTAINED UPON EXAMINATION. NO LIABILITY FOR UNCERTAIN TAX POSITIONS WAS RECORDED AS OF DECEMBER 31, 2023 OR 2022.</ExplanationTxt>
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      <SupplementalInformationDetail>
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      <SubtotalEmployeesCnt>0</SubtotalEmployeesCnt>
      <ContinuationTotalOfficeCnt>0</ContinuationTotalOfficeCnt>
      <ContinuationTotalEmployeeCnt>0</ContinuationTotalEmployeeCnt>
      <TotalOfficeCnt>0</TotalOfficeCnt>
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      <ContinuationSpentAmt>0</ContinuationSpentAmt>
      <TotalSpentAmt>0</TotalSpentAmt>
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        <TypeOfAssistanceTxt>RESEARCH STIPENDALL FELLOWSHIPS SUPPORT RESEARCH IN RESIDENCE AT THE LIBRARY COMPANY. THE REFERENCE STAFF MAINTAINS DAILY CONTACT WITH THE FELLOWS DURING THEIR FELLOWSHIP PERIOD.</TypeOfAssistanceTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART I, LINE 2:</FormAndLineReferenceDesc>
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        <DeferredCompensationFlngOrgAmt>0</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
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        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>181856</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
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        <NonCashCheckboxInd>X</NonCashCheckboxInd>
        <ContributionCnt>1</ContributionCnt>
        <NoncashContributionsRptF990Amt>50056</NoncashContributionsRptF990Amt>
        <MethodOfDeterminingRevenuesTxt>STOCK MARKET VALUE</MethodOfDeterminingRevenuesTxt>
      </SecuritiesPubliclyTradedGrp>
      <AnyPropertyThatMustBeHeldInd>0</AnyPropertyThatMustBeHeldInd>
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        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 6</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ORGANIZATION HAS SHAREHOLDERS WHO ARE CHARGED UNDER THE BYLAWS WITH ELECTING THE MEMBERS OF THE BOARD AND ITS OFFICERS. AN ANNUAL MEETING IS HELD WHERE THE ELECTION TAKES PLACE.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 7A</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ORGANIZATION HAS SHAREHOLDERS WHO ARE CHARGED UNDER THE BYLAWS WITH ELECTING THE MEMBERS OF THE BOARD AND ITS OFFICERS. AN ANNUAL MEETING IS HELD WHERE THE ELECTION TAKES PLACE.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
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        <ExplanationTxt>THE EXECUTIVE DIRECTOR AND STAFF ACCOUNTANT REVIEW THE FORM 990 WITH THE PAID PREPARER. THE AUDIT COMMITTEE REVIEWS THE FORM AND RECOMMENDS ACCEPTANCE OF THE 990 TO THE BOARD OF TRUSTEES, AND THE BOARD APPROVES THE 990 PRIOR TO FILING.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 12C</FormAndLineReferenceDesc>
        <ExplanationTxt>COVERED PERSONS ARE SOLICITED ANNUALLY, ASKING THESE INDIVIDUALS TO REPORT ANY POSSIBLE POTENTIAL CONFLICT.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
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        <ExplanationTxt>THE EXECUTIVE COMMITTEE OF THE BOARD OF TRUSTEES ANNUALLY EVALUATES THE PERFORMANCE OF THE EXECUTIVE DIRECTOR AND DETERMINES COMPENSATION USING COMPARABILITY DATA</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION C, LINE 19</FormAndLineReferenceDesc>
        <ExplanationTxt>THE IRS DETERMINATION LETTER OF 501(C)3 STATUS AND THE AUDITED FINANCIAL STATEMENTS ARE FURNISHED UPON REQUEST</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART XII, LINE 2C</FormAndLineReferenceDesc>
        <ExplanationTxt>THE PROCESS HAS NOT CHANGED FROM PRIOR YEAR</ExplanationTxt>
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          <CityNm>PHILADELPHIA</CityNm>
          <StateAbbreviationCd>PA</StateAbbreviationCd>
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        <PrimaryActivitiesTxt>PROPERTY OWNERSHIP</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>PA</LegalDomicileStateCd>
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</Return>