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      <Form990PartVIISectionAGrp>
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      <Form990PartVIISectionAGrp>
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      <ContractorCompensationGrp>
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        <ContractorAddress>
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      <ContractorCompensationGrp>
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          <USAddress>
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        <AdministrativeExpensesAmt>374650</AdministrativeExpensesAmt>
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      <CYMinus4YrEndwmtFundGrp>
        <BeginningYearBalanceAmt>57351266</BeginningYearBalanceAmt>
        <ContributionsAmt>385713</ContributionsAmt>
        <InvestmentEarningsOrLossesAmt>12491482</InvestmentEarningsOrLossesAmt>
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        <AdministrativeExpensesAmt>358750</AdministrativeExpensesAmt>
        <EndYearBalanceAmt>66797009</EndYearBalanceAmt>
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      <EndowmentsHeldRelatedOrgInd>0</EndowmentsHeldRelatedOrgInd>
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        <Desc>LIABILITIES UNDER SPLIT-INTEREST AGREEMENTS</Desc>
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      <TotalLiabilityAmt>271495</TotalLiabilityAmt>
      <FootnoteTextInd>X</FootnoteTextInd>
      <TotalRevEtcAuditedFinclStmtAmt>5072795</TotalRevEtcAuditedFinclStmtAmt>
      <NetUnrealizedGainsInvstAmt>1876374</NetUnrealizedGainsInvstAmt>
      <OtherRevenueAmt>57751</OtherRevenueAmt>
      <RevenueNotReportedAmt>1934125</RevenueNotReportedAmt>
      <RevenueSubtotalAmt>3138670</RevenueSubtotalAmt>
      <OtherRevenuesNotIncludedAmt>43630</OtherRevenuesNotIncludedAmt>
      <RevenueNotReportedFinclStmtAmt>43630</RevenueNotReportedFinclStmtAmt>
      <TotalRevenuePerForm990Amt>3182300</TotalRevenuePerForm990Amt>
      <TotExpnsEtcAuditedFinclStmtAmt>5381121</TotExpnsEtcAuditedFinclStmtAmt>
      <OtherExpensesIncludedAmt>57751</OtherExpensesIncludedAmt>
      <ExpensesNotReportedAmt>57751</ExpensesNotReportedAmt>
      <ExpensesSubtotalAmt>5323370</ExpensesSubtotalAmt>
      <OtherExpensesNotIncludedAmt>43630</OtherExpensesNotIncludedAmt>
      <ExpensesNotRptFinclStmtAmt>43630</ExpensesNotRptFinclStmtAmt>
      <TotalExpensesPerForm990Amt>5367000</TotalExpensesPerForm990Amt>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART III, LINE 1A:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE COLLECTIONS, WHICH WERE ACQUIRED THROUGH PURCHASES AND CONTRIBUTIONS SINCE THE SOCIETY'S INCEPTION, ARE NOT RECOGNIZED AS ASSETS ON THE STATEMENTS OF FINANCIAL POSITION. PURCHASE OF COLLECTION ITEMS ARE RECORDED AS DECREASES IN UNRESTRICTED NET ASSETS IF PURCHASED WITH UNRESTRICTED ASSETS AND AS DECREASES IN TEMPORARILY RESTRICTED OR PERMANENTLY RESTRICTED NET ASSETS IF PURCHASED WITH DONOR-RESTRICTED ASSETS. CONTRIBUTIONS OF COLLECTION ITEMS ARE NOT RECOGNIZED IN THE STATEMENT OF ACTIVITIES OR AS ASSETS. PROCEEDS FROM DEACCESSIONS ARE REFLECTED IN THE STATEMENT OF ACTIVITIES BASED ON THE ABSENCE OR EXISTENCE AND NATURE OF DONOR-IMPOSED RESTRICTIONS.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART III, LINE 4:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE SOCIETY'S COLLECTIONS ARE MADE UP OF MANUSCRIPTS, RARE BOOKS, PAMPHLETS, REFERENCE WORKS, ART OBJECTS AND OTHER ARTIFACTS OF HISTORICAL SIGNIFICANCE THAT ARE HELD FOR EDUCATIONAL, RESEARCH, HISTORIC, AND CURATORIAL PURPOSES. EACH OF THESE ITEMS IS CATALOGED, PRESERVED, AND CARED FOR, AND ACTIVITIES VERIFYING THEIR EXISTENCE AND ASSESSING THEIR CONDITION ARE PERFORMED CONTINUALLY.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART X, LINE 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE SOCIETY EVALUATES ALL SIGNIFICANT TAX POSITIONS AS REQUIRED BY GENERALLY ACCEPTED ACCOUNTING PRINCIPLES IN THE UNITED STATES. AS OF JUNE 30, 2015, THE SOCIETY DOES NOT BELIEVE THAT IT HAS TAKEN ANY TAX POSITIONS THAT WOULD REQUIRE THE RECORDING OF ANY ADDITIONAL TAX LIABILITY NOR DOES IT BELIEVE THERE ARE ANY UNREALIZED TAX BENEFITS THAT WOULD EITHER INCREASE OR DECREASE WITHIN THE NEXT TWELVE MONTHS.</ExplanationTxt>
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        <FormAndLineReferenceDesc>PART XI, LINE 2D - OTHER ADJUSTMENTS:</FormAndLineReferenceDesc>
        <ExplanationTxt>FUNDRAISING EXPENSES 57,751.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART XI, LINE 4B - OTHER ADJUSTMENTS:</FormAndLineReferenceDesc>
        <ExplanationTxt>PURCHASE OF COLLECTIONS 43,630.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART XII, LINE 2D - OTHER ADJUSTMENTS:</FormAndLineReferenceDesc>
        <ExplanationTxt>FUNDRAISING EXPENSES 57,751.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART XII, LINE 4B - OTHER ADJUSTMENTS:</FormAndLineReferenceDesc>
        <ExplanationTxt>PURCHASE OF COLLECTIONS 43,630.</ExplanationTxt>
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        <FoodAndBeverageEvent1Amt>24711</FoodAndBeverageEvent1Amt>
        <OtherDirectExpensesEvent1Amt>12458</OtherDirectExpensesEvent1Amt>
        <Event2Nm>NONE</Event2Nm>
        <GrossReceiptsTotalAmt>172407</GrossReceiptsTotalAmt>
        <CharitableContributionsTotAmt>172407</CharitableContributionsTotAmt>
        <RentFcltyCostsTotalEventsAmt>20582</RentFcltyCostsTotalEventsAmt>
        <FoodAndBeverageTotalEventsAmt>24711</FoodAndBeverageTotalEventsAmt>
        <OthDirectExpnssTotalEventsAmt>12458</OthDirectExpnssTotalEventsAmt>
        <DirectExpenseSummaryEventsAmt>57751</DirectExpenseSummaryEventsAmt>
        <NetIncomeSummaryAmt>-57751</NetIncomeSummaryAmt>
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        <GrantTypeTxt>FELLOWSHIPS</GrantTypeTxt>
        <RecipientCnt>33</RecipientCnt>
        <CashGrantAmt>125137</CashGrantAmt>
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        <FormAndLineReferenceDesc>PART I, LINE 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ORGANIZATION PROVIDES FELLOWSHIPS FOR RESEARCHERS TO USE ITS LIBRARY. IN ADDITION, PRIOR TO DISBURSING THE FINAL FELLOWSHIP PAYMENT THE SOCIETY RECEIVES A COPY OF THE FELLOWS RESEARCH WORK PRODUCT.</ExplanationTxt>
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      <WrittenPolicyRefTAndEExpnssInd>1</WrittenPolicyRefTAndEExpnssInd>
      <SubstantiationRequiredInd>1</SubstantiationRequiredInd>
      <CompensationCommitteeInd>X</CompensationCommitteeInd>
      <Form990OfOtherOrganizationsInd>X</Form990OfOtherOrganizationsInd>
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      <BoardOrCommitteeApprovalInd>X</BoardOrCommitteeApprovalInd>
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      <CompBasedOnRevenueOfFlngOrgInd>0</CompBasedOnRevenueOfFlngOrgInd>
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        <PersonNm>DENNIS A FIORI</PersonNm>
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        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>17236</DeferredCompensationFlngOrgAmt>
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        <TotalCompensationFilingOrgAmt>299299</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
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        <PersonNm>CLIFTON J TAYLOR</PersonNm>
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        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
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        <DeferredCompensationFlngOrgAmt>9994</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
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        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
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        <ExplanationTxt>THE ORGANIZATION PROVIDES A SOCIAL CLUB MEMBERSHIP FOR ITS PRESIDENT. THE AMOUNT IS PAID PURSUANT TO THE TERMS OUTLINED IN HIS ORIGINAL OFFER OF EMPLOYMENT.</ExplanationTxt>
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        <Desc>SEE PART II</Desc>
        <ContributionCnt>112</ContributionCnt>
        <NoncashContributionsRptF990Amt>0</NoncashContributionsRptF990Amt>
      </OtherNonCashContriTableGrp>
      <OtherNonCashContriTableGrp>
        <NonCashCheckboxInd>X</NonCashCheckboxInd>
        <Desc>ARTIFACTS</Desc>
        <ContributionCnt>9</ContributionCnt>
        <NoncashContributionsRptF990Amt>0</NoncashContributionsRptF990Amt>
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      <ReviewProcessUnusualNCGiftsInd>0</ReviewProcessUnusualNCGiftsInd>
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        <FormAndLineReferenceDesc>PART I, COLUMN (B):</FormAndLineReferenceDesc>
        <ExplanationTxt>SCHEDULE M, PART I, COLUMN B: INCLUDES BOOKS, ARTIFACTS, MANUSCRIPTS, FAMILY RECORDS, LETTERS, CORRESPONDENCE, CORPORATE DOCUMENTS, MAPS AND BROADSIDES. THE SOCIETY'S POLICY AS DESCRIBED IN SCHEDULE D, IS NOT TO RECORD THE VALUE OF DONATED COLLECTION ITEMS AS ASSETS.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 6</FormAndLineReferenceDesc>
        <ExplanationTxt>THE SOCIETY HAS ELECTED MEMBERS, KNOWN AS FELLOWS, THAT ELECT THE TRUSTEES AND OFFICERS. THE SOCIETY'S GENERAL MEMBERSHIP DOES NOT HAVE VOTING RIGHTS.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 7A</FormAndLineReferenceDesc>
        <ExplanationTxt>THE SOCIETY'S FELLOWS ELECT THE ORGANIZATION'S BOARD OF TRUSTEES AND OFFICERS AT THE SOCIETY'S ANNUAL MEETING. THE FELLOWS ELECT NEW FELLOWS FROM THE SOCIETY'S GENERAL MEMBERSHIP.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 7B</FormAndLineReferenceDesc>
        <ExplanationTxt>IN ADDITION TO ELECTING THE BOARD OF TRUSTEES AND OFFICERS, THE SOCIETY'S FELLOWS MUST APPROVE ANY AMENDMENTS TO THE BY-LAWS OR CHANGES TO THE GOVERNING DOCUMENTS.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 11</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ORGANIZATION PROVIDES A DRAFT OF FORM 990 TO ITS FINANCE COMMITTEE FOR THEIR REVIEW PRIOR TO FILING. ADDITIONALLY, A DRAFT COPY OF THE FORM 990 IS MADE AVAILABLE TO ALL TRUSTEES FOR COMMENT PRIOR TO FILING.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 12C</FormAndLineReferenceDesc>
        <ExplanationTxt>ANNUALLY, THE SOCIETY DISTRIBUTES A QUESTIONNAIRE TO ALL TRUSTEES,OFFICERS AND KEY EMPLOYEES REQUIRING THEM TO DISCLOSE ANY CONFLICTS OF INTEREST. THE SOCIETY REQUIRES THAT ALL PERSONS TO WHOM THE QUESTIONNAIRE IS DISTRIBUTED COMPLETE IT IN A TIMELY MANNER.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 15</FormAndLineReferenceDesc>
        <ExplanationTxt>EACH YEAR THE CHAIR OF THE BOARD OF TRUSTEES APPOINTS A COMPENSATION COMMITTEE MADE UP OF TRUSTEES TO REVIEW THE PERFORMANCE OF THE PRESIDENT/CEO AND COMPARABLE COMPENSATION DATA AND TO MAKE A RECOMMENDATION TO THE BOARD, WHICH THEN MAKES THE FINAL DECISION. THE DELIBERATIONS AND DECISION OF BOTH THE COMMITTEE AND THE BOARD ARE CONTEMPORANEOUSLY RECORDED IN THE MINUTES. EACH YEAR THE PRESIDENT, AS CEO, REVIEWS THE PERFORMANCE OF THE KEY EMPLOYEES AND COMPARABLE COMPENSATION DATA AND REPORTS HIS DECISIONS TO THE BOARD OF TRUSTEES, WHICH ARE INCORPORATED INTO THE ANNUAL BUDGET OF THE ORGANIZATION WHICH IS APPROVED BY THE BOARD OF TRUSTEES. THE DELIBERATIONS AND DECISIONS OF THE PRESIDENT ARE CONTEMPORANEOUSLY RECORDED AS IS THE APPROVAL OF THE BUDGET BY THE BOARD OF TRUSTEES.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION C, LINE 19</FormAndLineReferenceDesc>
        <ExplanationTxt>THE SOCIETY'S ANNUAL AUDITED FINANCIAL STATEMENTS, FORM 990 AND MASSACHUSETTS FORM PC ARE AVAILABLE TO THE PUBLIC ON ITS WEBSITE AT MASSHIST.ORG. THESE DOCUMENTS ARE ALSO AVAILABLE ON THE MASSACHUSETTS ATTORNEY GENERAL'S WEBSITE AT CHARITIES.AGO.MA.US. THE SOCIETY'S BYLAWS AND CONFLICT OF INTEREST POLICY ARE AVAILABLE ON THE SOCIETY'S WEBSITE. THE SOCIETY WILL MAKE PRINTED COPIES AVAILABLE UPON WRITTEN REQUEST.</ExplanationTxt>
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