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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Collections descriptions (Part III, line 4)</FormAndLineReferenceDesc>
        <ExplanationTxt>Preservation of the Gibson House and its artifacts as well as educating the public on victorian urban life.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Endowment funds intended uses (Part V, line 4)</FormAndLineReferenceDesc>
        <ExplanationTxt>Curator Endowment: It is funded by donations specifically raised to secure the long-term compensation of the curator. This endowment ensures the continuity and stability of the curator role, underscoring the museums commitment to curatorial excellence.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Footnote for uncertain tax position under FIN 48 (Part X)</FormAndLineReferenceDesc>
        <ExplanationTxt>The Organization has evaluated the tax positions taken on returns for open years and those expected to be taken on returns for the year ended September 30, 2023. It is Managements belief that such tax positions are more likely than not to be sustained upon examination by tax authorities. Accordingly, no liability for uncertain tax positions is reflected in these financial statements. Returns for tax years beginning with those filed for the year ended September 30, 2022 are open to examination.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990 governing body review Part VI line 11</FormAndLineReferenceDesc>
        <ExplanationTxt>The annual form 990 is prepared by the independent certified public accountant, reviewed by the Finance Committee and signed by the President.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Conflict of interest policy compliance Part VI line 12c</FormAndLineReferenceDesc>
        <ExplanationTxt>The organization has established a policy that requires each new key employee, officer or director to review a copy of the Policy on Conflicts of Interest and Disclosure of Certain Interests and to acknowledge in writing that he or she has done so. Additionally, each key employee, officer or director, annually complete a disclusure form identifying any relationships, positions or cirsumstances in which the employee is involved that he or she believes could contribute to a conflict of interest arising.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>CEO executive director top management comp Part VI line 15a</FormAndLineReferenceDesc>
        <ExplanationTxt>The salary of the Museum Administrator, who fulfills many duties akin to those of an Executive Director, is reviewed and approved by the Board of Directors during the annual budget process.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Governing documents etc available to public Part VI line 19</FormAndLineReferenceDesc>
        <ExplanationTxt>The Organization makes its governing documents and conflict of interest policy available to the public upon request.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part III response or note to any other line in Part III</FormAndLineReferenceDesc>
        <ExplanationTxt>(continued from Form 990, page 2, Part III, Line 1)...in its urban context to provide education and enjoyment to the broadest possible audience; promoting knowledge of Back Bay history and material culture.</ExplanationTxt>
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</Return>