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        <EOYAmt>464448</EOYAmt>
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      <OtherChangesInNetAssetsAmt>0</OtherChangesInNetAssetsAmt>
      <MethodOfAccountingCashInd>X</MethodOfAccountingCashInd>
      <AccountantCompileOrReviewInd>1</AccountantCompileOrReviewInd>
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        <CurrentTaxYearMinus2YearsAmt>400000</CurrentTaxYearMinus2YearsAmt>
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        <CurrentTaxYearMinus3YearsAmt>231</CurrentTaxYearMinus3YearsAmt>
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        <CurrentTaxYearMinus1YearAmt>422</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>147</CurrentTaxYearAmt>
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      <PublicSupportPY170Pct>0.99900</PublicSupportPY170Pct>
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    <IRS990ScheduleD documentId="RetDoc1040000001">
      <CollectionUsedPubExhibitionInd>X</CollectionUsedPubExhibitionInd>
      <CollectionUsedPreservationInd>X</CollectionUsedPreservationInd>
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      <TotalBookValueLandBuildingsAmt>0</TotalBookValueLandBuildingsAmt>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART III, LINE 1A:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE EXHIBITS AND COLLECTIONS, WHICH WERE ACQUIRED THROUGH PURCHASES AND CONTRIBUTIONS SINCE THE SOCIETY'S INCEPTION, ARE NOT RECOGNIZED AS ASSETS ON THE STATEMENT OF FINANCIAL POSITION - CASH BASIS, PURCHASES OF EXHIBIT AND COLLECTION ITEMS ARE RECORDED AS DECREASES IN UNRESTRICTED NET ASSETS IN THE YEAR IN WHICH THE ITEMS ARE ACQUIRED. CONTRIBUTIONS OF EXHIBIT AND COLLECTION ITEMS ARE NOT REFLECTED IN THE FINANCIAL STATEMENTS.</ExplanationTxt>
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    <IRS990ScheduleO documentId="RetDoc1044400001">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 2</FormAndLineReferenceDesc>
        <ExplanationTxt>SEVEN OF THE FOURTEEN TRUSTEES OF THE HISTORICAL SOCIETY ARE FEDERAL JUDGES. THE HONORABLE CATHERINE C. BLAKE, THE VICE PRESIDENT AND A TRUSTEE OF THE HISTORICAL SOCIETY, HAS SERVED AS A UNITED STATES DISTRICT JUDGE IN THE DISTRICT OF MARYLAND SINCE 1995. THE HONORABLE SUSAN K. GAUVEY, A TRUSTEE OF THE HISTORICAL SOCIETY, HAS SERVED AS A UNITED STATES MAGISTRATE JUDGE IN THE DISTRICT OF MARYLAND SINCE 1996. THE HONORABLE PETER J. MESSITTE, A TRUSTEE OF THE HISTORICAL SOCIETY, HAS SERVED AS A UNITED STATES DISTRICT JUDGE IN THE DISTRICT OF MARYLAND SINCE 1993. THE HONORABLE ALEXANDER WILLIAMS, JR., A TRUSTEE, HAS SERVED AS A UNITED STATES DISTRICT JUDGE IN THE DISTRICT OF MARYLAND SINCE 1994. THE HONORABLE JAMES F. SCHNEIDER, A TRUSTEE, HAS SERVED AS A UNITED STATES BANKRUPTCY JUDGE IN THE DISTRICT OF MARYLAND SINCE 1982. ADDITIONALLY, THE HONORABLE GEORGE RUSSELL, III, A TRUSTEE, WHO WAS A BALTIMORE CITY CIRCUIT JUDGE WHEN HE JOINED THE BOARD, IS NOW A U.S. DISTRICT JUDGE IN THE DISTRICT OF MARYLAND AND HAS SERVED AS A UNITED STATES DISTRICT JUDGE SINCE 2012. THE HONORABLE J. FREDERICK MOTZ, A TRUSTEE OF THE HISTORICAL SOCIETY, HAS SERVED AS A UNITED STATES DISTRICT JUDGE IN THE DISTRICT OF MARYLAND SINCE 1985.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 11</FormAndLineReferenceDesc>
        <ExplanationTxt>COPIES OF THE FORM WERE PROVIDED TO THE BOARD AND ANY DISCREPANCIES DISCUSSED PRIOR TO FILING.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 12C</FormAndLineReferenceDesc>
        <ExplanationTxt>IN CONNECTION WITH ANY ACTUAL OR POSSIBLE CONFLICT OF INTEREST, AN INTERESTED PERSON MUST DISCLOSE THE EXISTENCE OF THE FINANCIAL INTEREST AND BE GIVEN THE OPPORTUNITY TO DISCLOSE ALL MATERIAL FACTS TO THE TRUSTEES AND MEMBERS OF COMMITTEES WITH GOVERNING BOARD DELEGATED POWERS CONSIDERING THE PROPOSED TRANSACTION OR ARRANGEMENT. AFTER DISCLOSURE, THE GOVERNING BOARD OR COMMITTEE WILL DISCUSS AND VOTE UPON WHETHER A CONFLICT OF INTEREST EXISTS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION C, LINE 19</FormAndLineReferenceDesc>
        <ExplanationTxt>THE HISTORICAL SOCIETY'S GOVERNING DOCUMENTS, CONFLICT OF INTEREST POLICY AND IRS APPLICATION FOR EXEMPTION AND DETERMINATION LETTER ARE AVAILABLE UPON REQUEST.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
  </ReturnData>
</Return>