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        <FormAndLineReferenceDesc>PART III, LINE 12</FormAndLineReferenceDesc>
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      <CollectionUsedPubExhibitionInd>X</CollectionUsedPubExhibitionInd>
      <CollUsedScholarlyRsrchInd>X</CollUsedScholarlyRsrchInd>
      <CollectionUsedPreservationInd>X</CollectionUsedPreservationInd>
      <SolicitedAssetsSaleInd>false</SolicitedAssetsSaleInd>
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      <FootnoteTextInd>X</FootnoteTextInd>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>SCHEDULE D, PAGE 1, PART III, LINE 1A</FormAndLineReferenceDesc>
        <ExplanationTxt>MUSEUM COLLECTION IN ACCORDANCE WITH ACCOUNTING STANDARDS UPDATE (ASU) 2019-03, NOT-FOR- PROFIT ENTITIES (TOPIC 958): UPDATING THE DEFINITION OF COLLECTIONS AND THE INDUSTRY PRACTICE TYPICALLY FOLLOWED BY MUSEUMS, ITEMS PURCHASED OR DONATED ARE NOT INCLUDED AS ASSETS IN THE ACCOMPANYING STATEMENTS OF FINANCIAL POSITION. PURCHASES OF COLLECTION ITEMS ARE RECORDED IN THE YEAR ACQUIRED AS DECREASES IN NET ASSETS WITHOUT DONOR RESTRICTIONS. DONATED ITEMS ARE NOT RECORDED.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>SCHEDULE D, PAGE 2, PART III, LINE 4</FormAndLineReferenceDesc>
        <ExplanationTxt>THE SOCIETY'S COLLECTION CONSISTS OF ITEMS THAT HAVE A HISTORIC CONNECTION TO THE MONONGAHELA AREA AND INCLUDE OBJECTS, PHOTOGRAPHS, MAPS, AND EPHEMERA.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>SCHEDULE D, PAGE 3, PART X</FormAndLineReferenceDesc>
        <ExplanationTxt>MONONGAHELA AREA HISTORICAL SOCIETY, INC. QUALIFIES AS A TAX EXEMPT ORGANIZATION UNDER SECTION 501(C)(3) OF THE INTERNAL REVENUE CODE AND, THEREFORE, NO PROVISION FOR INCOME TAXES HAS BEEN RECORDED IN THESE FINANCIAL STATEMENTS. IN ADDITION, THE SOCIETY HAS BEEN DETERMINED BY THE INTERNAL REVENUE SERVICE NOT TO BE A "PRIVATE FOUNDATION" WITHIN THE MEANING OF SECTION 509(A) OF THE INTERNAL REVENUE CODE. THERE WAS NO UNRELATED BUSINESS INCOME DURING THE YEARS ENDED DECEMBER 31, 2024. THE SOCIETY HAS ADOPTED FINANCIAL ACCOUNTING STANDARDS BOARD (FASB) ACCOUNTING STANDARDS CODIFICATION (ASC) 740 10, ACCOUNTING FOR UNCERTAINTY IN INCOME TAXES, WHICH CLARIFIES THE ACCOUNTING FOR UNCERTAINTY IN INCOME TAXES BY PRESCRIBING THE RECOGNITION THRESHOLD A TAX POSITION IS REQUIRED TO MEET BEFORE BEING RECOGNIZED IN THE FINANCIAL STATEMENTS. THE STANDARD ALSO PROVIDES GUIDANCE ON DERECOGNITION, CLASSIFICATION, INTEREST AND PENALTIES, ACCOUNTING IN INTERIM PERIODS, DISCLOSURE, AND TRANSITION. MANAGEMENT HAS REVIEWED THE IMPACT OF ASC 740 10 ON THE ACCOMPANYING FINANCIAL STATEMENTS AND HAS DETERMINED THAT THERE ARE NO MATERIAL UNCERTAIN TAX POSITIONS OR UNRECOGNIZED TAX BENEFITS AND THAT THERE IS NO MATERIAL IMPACT ON THE FINANCIAL STATEMENTS. IN ADDITION, THERE WERE NO PENALTIES OR INTEREST RECOGNIZED IN THE STATEMENTS OF ACTIVITIES. MANAGEMENT'S ASC 740 10 EVALUATION WAS PERFORMED FOR THE TAX YEARS 2021 THROUGH 2024, WHICH ARE THE YEARS THAT REMAIN SUBJECT TO EXAMINATION BY THE INTERNAL REVENUE SERVICE AND VARIOUS STATE AGENCIES AS OF DECEMBER 31, 2024.</ExplanationTxt>
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          <PersonNm>LAURA MAGONE</PersonNm>
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        <RelationshipDescriptionTxt>PRESIDENT</RelationshipDescriptionTxt>
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        <TransactionDesc>COMMISSION</TransactionDesc>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990 - ORGANIZATION'S MISSION</FormAndLineReferenceDesc>
        <ExplanationTxt>THE MONONGAHELA AREA HISTORICAL SOCIETY FUNCTIONS AS A MONTHLY MEETING ORGANIZATION WHICH FOCUSES ON THE HISTORY OF THE MONONGAHELA AREA AND HAS A STRONG VOICE IN THE COMMUNITY ON SUCH ISSUES AS: HISTORIC PRESERVATION, COMMUNITY DEVELOPMENT, AND COMMUNITY IDENTITY.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PAGE 6, PART VI, LINE 2</FormAndLineReferenceDesc>
        <ExplanationTxt>LAURA MAGONE WANDA MAGONE PRESIDENT HISTORIAN MOTHER AND DAUGHTER</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PAGE 6, PART VI, LINE 11B</FormAndLineReferenceDesc>
        <ExplanationTxt>A COPY OF THE FORM 990 IS REVIEWED AND APPROVED AT A BOARD MEETING PRIOR TO BEING FILED.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PAGE 6, PART VI, LINE 12C</FormAndLineReferenceDesc>
        <ExplanationTxt>BOARD MEMBERS AND OFFICERS ARE REQUIRED TO INFORM BOARD OF DIRECTORS ON AN ANNUAL BASIS WHEN A CONFLICT OF INTEREST ARISES OR MAY CAUSE ISSUES.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PAGE 6, PART VI, LINE 19</FormAndLineReferenceDesc>
        <ExplanationTxt>AVAILABLE UPON REQUEST.</ExplanationTxt>
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</Return>