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      <TotalSupportCalendarYearGrp>
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      <Form990ScheduleAPartVIGrp>
        <FormAndLineReferenceDesc>Pt III Ln 12</FormAndLineReferenceDesc>
        <ExplanationTxt>Other Income Part III, Line 12 Description: Special events 2013: 21309. 2014: 12578. 2015: 28100. 2016: 49868. 2017: 12356.</ExplanationTxt>
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    </IRS990ScheduleA>
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      <CollUsedScholarlyRsrchInd>X</CollUsedScholarlyRsrchInd>
      <CollectionUsedPreservationInd>X</CollectionUsedPreservationInd>
      <SolicitedAssetsSaleInd>false</SolicitedAssetsSaleInd>
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        <EndYearBalanceAmt>335575</EndYearBalanceAmt>
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        <EndYearBalanceAmt>332333</EndYearBalanceAmt>
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        <InvestmentEarningsOrLossesAmt>15910</InvestmentEarningsOrLossesAmt>
        <OtherExpendituresAmt>10079</OtherExpendituresAmt>
        <EndYearBalanceAmt>358768</EndYearBalanceAmt>
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      <PrmnntEndowmentBalanceEOYPct>0.45000</PrmnntEndowmentBalanceEOYPct>
      <EndowmentsHeldUnrelatedOrgInd>false</EndowmentsHeldUnrelatedOrgInd>
      <EndowmentsHeldRelatedOrgInd>false</EndowmentsHeldRelatedOrgInd>
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      <EquipmentGrp>
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      <FootnoteTextInd>X</FootnoteTextInd>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Pt X, Line 2</FormAndLineReferenceDesc>
        <ExplanationTxt>The Society has adopted the application of the provisions of FASB ASC 740-10 (formerly FASB Interpretation No. 48, "Accounting For Uncertainty in Income Taxes"). The primary tax positions made by the Organization are the existence/non-existence of Unrelated Business Income Tax and the Society's status as an exempt organization under Section 501(c)(3) of the Internal Revenue Code. The Society currently evaluates all tax positions, and makes determinations regarding the likelihood of those positions being upheld under review. For the year presented, and as a result of adoption, the Society has not recognized any tax benefits or loss contingencies for uncertain tax positions based on its evaluations. The Society's Forms 990, Return of Organization Exempt from Income Tax, for the years ending March 31, 2018, 2017, 2016 and 2015 are subject to examination by the IRS, generally for 3 years after they are filed.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Pt III, Line 4</FormAndLineReferenceDesc>
        <ExplanationTxt>The Society's collection consists of historic buildings, works of art, historical artifacts, and furniture. The collections are maintained for public exhibition, education and research in furtherance of public service, rather than for financial gain.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Pt III, Line 1a</FormAndLineReferenceDesc>
        <ExplanationTxt>In conformity with accounting policies generally followed by museums, the value of the Society's collection has been excluded from the statement of financial position, and gifts of art objects are excluded from revenue in the statement of activities. Purchases of collections and art objects are recorded as other decreases in net assets per the financial statements and not included in Part IX Statement of Functional Expenses on the Form 990.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Pt V, Line 4</FormAndLineReferenceDesc>
        <ExplanationTxt>Permanently restricted net assets are to be held in an endowment account and the income can be used for general purposes and for the conservation of collections. Board designated funds are funds generated from the sale of items several years ago to be held intact. Any accretions to the fund over and above that amount may be used by the Collections Committee for acquisitions to the collection or for care of the collection.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleD>
    <IRS990ScheduleG documentId="00000005">
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        <Event1Nm>Garden Tour</Event1Nm>
        <GrossReceiptsEvent1Amt>16575</GrossReceiptsEvent1Amt>
        <GrossRevenueEvent1Amt>16575</GrossRevenueEvent1Amt>
        <OtherDirectExpensesEvent1Amt>3421</OtherDirectExpensesEvent1Amt>
        <Event2Nm>NONE</Event2Nm>
        <GrossReceiptsTotalAmt>16575</GrossReceiptsTotalAmt>
        <GrossRevenueTotalEventsAmt>16575</GrossRevenueTotalEventsAmt>
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        <DirectExpenseSummaryEventsAmt>3421</DirectExpenseSummaryEventsAmt>
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    <IRS990ScheduleO documentId="00000006" softwareId="17005306">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Pt VI, Line 11b</FormAndLineReferenceDesc>
        <ExplanationTxt>A copy of the Form 990 was provided to the Officers and Board of Directors for review and approval prior to filing.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Pt VI, Line 12c</FormAndLineReferenceDesc>
        <ExplanationTxt>This is achieved through self-reporting by board members and officers.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Pt VI, Line 19</FormAndLineReferenceDesc>
        <ExplanationTxt>The Society makes its governing documents, policies and financial statements available to the public upon request. The financial statements and Form 990 are also available on the Guidestar website. In addition, the Massachusetts Form PC is available for public viewing on the Attorney General's website.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Pt XI</FormAndLineReferenceDesc>
        <ExplanationTxt>Other change in net assets is acquisition of collections of $175.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part IX, Line 24e</FormAndLineReferenceDesc>
        <ExplanationTxt>Bank and credit card fees 884. 0. 884. 0.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part IX, Line 24e</FormAndLineReferenceDesc>
        <ExplanationTxt>Hospitality 494. 494. 0. 0.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part IX, Line 24e</FormAndLineReferenceDesc>
        <ExplanationTxt>Subcontractors 4708. 4708. 0. 0.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part IX, Line 24e</FormAndLineReferenceDesc>
        <ExplanationTxt>Program expenses 3485. 3485. 0. 0.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part IX, Line 24e</FormAndLineReferenceDesc>
        <ExplanationTxt>Dues and subscriptions 1374. 0. 1374. 0.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part IX, Line 24e</FormAndLineReferenceDesc>
        <ExplanationTxt>NG Brown annuity 2200. 2200. 0. 0.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part IX, Line 24e</FormAndLineReferenceDesc>
        <ExplanationTxt>Website cost 192. 0. 192. 0.</ExplanationTxt>
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</Return>