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      <TotalRevEtcAuditedFinclStmtAmt>6918891</TotalRevEtcAuditedFinclStmtAmt>
      <NetUnrealizedGainsInvstAmt>380132</NetUnrealizedGainsInvstAmt>
      <OtherRevenueAmt>228742</OtherRevenueAmt>
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      <RevenueSubtotalAmt>6310017</RevenueSubtotalAmt>
      <InvestmentExpensesNotIncldAmt>38410</InvestmentExpensesNotIncldAmt>
      <RevenueNotReportedFinclStmtAmt>38410</RevenueNotReportedFinclStmtAmt>
      <TotalRevenuePerForm990Amt>6348427</TotalRevenuePerForm990Amt>
      <TotExpnsEtcAuditedFinclStmtAmt>6251555</TotExpnsEtcAuditedFinclStmtAmt>
      <OtherExpensesIncludedAmt>228742</OtherExpensesIncludedAmt>
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      <ExpensesSubtotalAmt>6022813</ExpensesSubtotalAmt>
      <InvestmentExpensesNotIncld2Amt>38410</InvestmentExpensesNotIncld2Amt>
      <ExpensesNotRptFinclStmtAmt>38410</ExpensesNotRptFinclStmtAmt>
      <TotalExpensesPerForm990Amt>6061223</TotalExpensesPerForm990Amt>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART III - LINE 4</FormAndLineReferenceDesc>
        <ExplanationTxt>the gilder lehrman collection serves as a repository for manuscripts and other selected materials that document the history of united states. through its services, the collection supports the educational mission of the gilder lehrman institute of american history and, secondarily, academic research and publication.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART V - LINE 4</FormAndLineReferenceDesc>
        <ExplanationTxt>THE TEMPORARILY RESTRICTED FUNDS ARE TO BE USED FOR AMERICAN HISTORY EDUCATION PROGRAMS THAT ARE TO OCCUR IN FUTURE FISCAL YEARS.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART X - LINE 2</FormAndLineReferenceDesc>
        <ExplanationTxt>As of June 30, 2014, no amounts have been recognized for benefits resulting from uncertain income tax positions. The Institute's tax returns for the 2011 fiscal year and forward are subject to the usual review by the appropriate authorities.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART XI - LINE 2D</FormAndLineReferenceDesc>
        <ExplanationTxt>2D. COST OF GOODS SOLD: 8,718. 2D. DIRECT SPECIAL EVENT EXPENSES: 220,024. 4B. INVESTMENT MANAGEMENT FEES, NET: 38,410.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART XII - LINE 2D</FormAndLineReferenceDesc>
        <ExplanationTxt>2D. COST OF GOODS SOLD: 8,718. 2D. DIRECT SPECIAL EVENT EXPENSES: 220,024. 4B. INVESTMENT MANAGEMENT FEES, NET: 38,410.</ExplanationTxt>
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      <RecipientTable>
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          <City>ANDOVER</City>
          <State>KS</State>
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      <RecipientTable>
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          <City>PHILADELPHIA</City>
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      <RecipientTable>
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          <City>BRONX</City>
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      <RecipientTable>
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          <City>NEW YORK</City>
          <State>NY</State>
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          <City>STATEN ISLAND</City>
          <State>NY</State>
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      <RecipientTable>
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          <AddressLine1>2 WEST 77TH ST</AddressLine1>
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          <State>NY</State>
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          <AddressLine1>300 WASHINGTON AVE</AddressLine1>
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          <State>MD</State>
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          <BusinessNameLine1>ST FRANCIS PREPARTORY</BusinessNameLine1>
        </RecipientBusinessName>
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          <City>FRESH MEADOWS</City>
          <State>NY</State>
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        </USAddress>
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      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1>HEIGHTS HIGH SCHOOL</BusinessNameLine1>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1>201 NORTH WATER</AddressLine1>
          <City>WICHITA</City>
          <State>KS</State>
          <ZIPCode>67202</ZIPCode>
        </USAddress>
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      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1>SCHOOL WITHOUT WALLS</BusinessNameLine1>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1>PO BOX 7247-0244</AddressLine1>
          <City>PHILADELPHIA</City>
          <State>PA</State>
          <ZIPCode>191700001</ZIPCode>
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      <GrantsOtherAsstToIndivInUSGrp>
        <GrantTypeTxt>FELLOWSHIPS</GrantTypeTxt>
        <RecipientCnt>10</RecipientCnt>
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      </GrantsOtherAsstToIndivInUSGrp>
      <GrantsOtherAsstToIndivInUSGrp>
        <GrantTypeTxt>NATIONAL BOOK PRIZE</GrantTypeTxt>
        <RecipientCnt>1</RecipientCnt>
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      </GrantsOtherAsstToIndivInUSGrp>
      <GrantsOtherAsstToIndivInUSGrp>
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      </GrantsOtherAsstToIndivInUSGrp>
      <GrantsOtherAsstToIndivInUSGrp>
        <GrantTypeTxt>STUDENT ESSAY AWARDS</GrantTypeTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART I - LINE 2</FormAndLineReferenceDesc>
        <ExplanationTxt>The Institute gives grants to schools and organizations to run American historY programs and Saturday Academies of American history. Strong oversight is exercised by providing written grant letters outlining standardized procedures, policies and outcomes required. Other measures include site visits, progress and final reports from organization on performance, statistics and finance, and in some cases, documentation via actual receipts of funds spent. A program officer is assigned to each organization and communication is made throughout the grant period.</ExplanationTxt>
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      <BoatsAndPlanesGrp />
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      <SecuritiesPubliclyTradedGrp>
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        <ContributionCnt>1</ContributionCnt>
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        <FormAndLineReferenceDesc>PART III - LINE 1</FormAndLineReferenceDesc>
        <ExplanationTxt>Founded in 1994 by Richard Gilder and Lewis E. Lehrman, the Gilder Lehrman Institute of American History is a nonprofit organization devoted to the improvement of history education. The Institute has developed an array of programs for schools, teachers, and students that now operate in all fifty states, including a website that features more than 60,000 unique historical documents in the Gilder Lehrman Collection. Each year the Institute offers support and resources to tens of thousands of teachers, and through them enhances the education of more than a million students. The Institute's programs have been recognized by awards from the White House, the National Endowment for the Humanities, and the Organization of American Historians.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART III - LINE 4D</FormAndLineReferenceDesc>
        <ExplanationTxt>OTHER PROGRAMS: - HISTORY TEACHER OF THE YEAR AWARD PROGRAM - GL SCHOLARS AWARD PROGRAM - NATIONAL BOOK PRIZES - CONFERENCES OUTREACH - SCHOLARLY FELLOWSHIPS AWARDS PROGRAM</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART VI, SECTION A. - QUESTION 2</FormAndLineReferenceDesc>
        <ExplanationTxt>DR. JAMES G. BASKER (PRESIDENT AND TRUSTEE), IS A PAID CONSULTANT TO THE GILDER FOUNDATION, WHICH IS DIRECTED BY RICHARD GILDER (TREASURER &amp; executive v.p.), AND WHICH DONATEs ANNUALLY TO THE GILDER LEHRMAN INSTITUTE. RICHARD GILDER ENGAGED IN A BUSINESS TRANSACTION WITH LEWIS LEHRMAN. Richard Gilder and Shaiza Rizavi engaged in a business transaction.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART VI, SECTION B. - QUESTION 11B</FormAndLineReferenceDesc>
        <ExplanationTxt>DR. JAMES G. BASKER (PRESIDENT &amp; trustee), AND LESLEY S. HERRMANN (EXECUTIVE DIRECTOR) REVIEWED THE FORM 990 BEFORE IT WAS FILED. A COPY WAS FURNISHED TO ALL MEMBERS OF THE BOARD OF TRUSTEES PRIOR TO FILING.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART VI, SECTION B. - QUESTION 12c</FormAndLineReferenceDesc>
        <ExplanationTxt>the CONFLICT OF INTEREST POLICy is supplied to all trustees and completed on an annual basis.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART VI, SECTION B. - QUESTIONS 15A &amp; 15B</FormAndLineReferenceDesc>
        <ExplanationTxt>EXECUTIVE DIRECTOR COMPENSATION IS REVIEWED USING COMPARABILITY DATA BY AT LEAST ONE MEMBER OF THE BOARD OF TRUSTEES.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART VI, SECTION C. - QUESTION 19</FormAndLineReferenceDesc>
        <ExplanationTxt>THE INSTITUTE'S AUDITED FINANCIAL STATEMENTS ARE AVAILABLE ON ITS WEBSITE. THE GOVERNING DOCUMENTS AND CONFLICT OF INTEREST POLICY WILL BE made AVAILABLE TO THE PUBLIC UPON REQUEST.</ExplanationTxt>
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