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        <FormAndLineReferenceDesc>PART X, LINE 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>HSUSC ACCOUNTS FOR UNCERTAINTY IN INCOME TAXES USING A RECOGNITION THRESHOLD OF MORE-LIKELY-THAN NOT TO BE SUSTAINED UPON EXAMINATION BY THE APPROPRIATE TAXING AUTHORITY. MEASUREMENT OF THE TAX UNCERTAINTY OCCURS IF THE RECOGNITION THRESHOLD IS MET. MANAGEMENT DETERMINED THERE WERE NO UNCERTAINTIES THAT MET THE RECOGNITION THRESHOLD IN THE CURRENT TAX YEAR. HSUSC HOLDS HISTORIC FARM BUILDINGS, RELATED ANTIQUE FURNISHINGS, AND CERTAIN ANTIQUE FARM EQUIPMENT. THESE ASSETS ARE VALUED BASED ON APPRAISED VALUES AT THE DATE THEY WERE DONATED TO HSUSC. NO DEPRECIATION IS TAKEN ON THESE ASSETS, IN ACCORDANCE WITH ACCOUNTING PRINCIPLES GENERALLY ACCEPTED IN THE UNITED STATES OF AMERICA, BECAUSE HSUSC INTENDS TO PRESERVE THESE ASSETS IN PERPETUITY.</ExplanationTxt>
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        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 2</FormAndLineReferenceDesc>
        <ExplanationTxt>RACHEL H. CARLSON PRESIDENT ROGER W. HEINS TREASURER</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 7A</FormAndLineReferenceDesc>
        <ExplanationTxt>ELECTIONS OF MEMBERS AND THEIR RIGHTS AMENDED AND RESTATED BYLAWS WERE ADOPTED AUGUST 10, 2008.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 8A</FormAndLineReferenceDesc>
        <ExplanationTxt>DOCUMENTATION BY GOVERNING BODY MINUTES AND BOOKS ARE MAINTAINED.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 8B</FormAndLineReferenceDesc>
        <ExplanationTxt>DOCUMENTATION BY COMMITTEE MINUTES AND MINUTE BOOK ARE MAINTAINED.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 11B</FormAndLineReferenceDesc>
        <ExplanationTxt>FINANCIAL STATEMENT REVIEW.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 12C</FormAndLineReferenceDesc>
        <ExplanationTxt>SEE CONFLICT OF INTEREST AND DISCLOSURE QUESTIONNAIRE.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION C, LINE 19</FormAndLineReferenceDesc>
        <ExplanationTxt>HISTORICAL RECORDS CONTRIBUTED TO OR OTHERWISE ACQUIRED BY THE SOCIETY FOR PUBLIC ACCESS, RESEARCH &amp; USE ARE STORED AT THE GILFILLAN FARM (1950 WASHINGTON ROAD, UPPER ST. CLAIR, PA 15241) &amp; ARE AVAILABLE UPON REQUEST.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART XI, LINE 9:</FormAndLineReferenceDesc>
        <ExplanationTxt>CHANGE IN VALUE OF BENEFICIAL INTEREST IN TRUST 59,602.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART III, LINE 4A</FormAndLineReferenceDesc>
        <ExplanationTxt>THE SOCIETY OPERATES A MODEL WORKING FARM &amp; LATE 1900 FARMHOUSE FOR PURPOSES OF HISTORICAL, EDUCATIONAL &amp; CULTURAL TOURS. LIMITED CROPS GROWN ON THE PROPERTY ARE DONATED TO LOCAL FOOD BANKS. THE SOCIETY IS ALSO ENGAGED IN PROVIDING PUBLICATIONS &amp; A REPOSITORY OF HISTORICAL PHOTOGRAPHS (1800'S &amp; EARLY 1900'S) OF AREA &amp; FORMER RESIDENTS, DOCUMENTS, ANTIQUES (TOOLS, EQUIPMENT, HOUSEWARE, MEMORABILIA) FOR DISPLAY &amp; HISTORICAL RESEARCH. THE FARM IS SURROUNDED BY A LOCAL WALKING/JOGGING TRAIL THAT IS USED BY HUNDREDS OF PEOPLE EACH DAY &amp; THE WORKINGS OF THE FARM ARE ON DISPLAY FROM BOTH THE TRAIL &amp; LOCAL ROADS. DURING 2022, THE SOCIETY WORKED TO TRANSITION TO HORSES ON THE FARM IN CONJUNCTION WITH HORSES WITH HOPE. IT ALSO PROVIDES GENEALOGICAL DATA FOR FAMILIES TRYING TO TRACE THEIR FAMILY BACKGROUNDS. THE PRESERVATION OF THE BUILDINGS &amp; MAINTENANCE OF THE NATURAL SURROUNDINGS OF THIS "DESIGNATED NATIONAL HISTORIC PLACE" IS AN ASSET TO THE COMMUNITY &amp; ITS NATURAL HERITAGE.</ExplanationTxt>
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        <FormAndLineReferenceDesc>FORM 990, PAGE 1, SECTION B</FormAndLineReferenceDesc>
        <ExplanationTxt>THIS AMENDMENT IS TO CORRECT FOR THE FOLLOWING ITEMS: 1. SCHEDULE A, PART II, LINE 5 - REMOVED PENNSYLVANIA HISTORICAL AND MUSEUM COMMISSION AS THEY ARE A GOVERNMENTAL AGENCY AND SHOULD NOT BE PRESENTED IN THIS CALCULATION. 2. SCHEDULE G, PART II, COLUMN B - ADDED GARDEN FETE TO PROPERLY PRESENT INCOME (PREVIOUSLY REPORTED ON FORM 990, PART VIII, LINE 1F) AND RELATED EXPENSES (PREVIOUSLY REPORTED ON SCHEDULE G, PART II, LINE 9, COLUMN A) AS A SECOND FUNDRAISING EVENT. 3. FORM 990, PAGE 10, PART IX, LINE 24B - ADDED ADDITIONAL FARM EXPENSES (PREVIOUSLY REPORTED ON SCHEDULE G, PART II, LINE 9, COLUMN A). 4. SCHEDULE G, PART II, LINE 2, COLUMN A - UPDATED THE AMOUNT OF CONTRIBUTION FROM FUNDRAISING EVENTS. 5. SCHEDULE A, PART II, COLUMN D - UPDATED FOR 2023 AMENDED FORM 990 6. SCHEDULE A, PART II, LINE 15 - UPDATED FOR 2023 AMENDED FORM 990 7. FORM 990, PART I - UPDATED FOR 2023 AMENDED FORM 990</ExplanationTxt>
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