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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>SCHEDULE D, PAGE 1, PART II, LINE 9</FormAndLineReferenceDesc>
        <ExplanationTxt>EASEMENTS ARE RECORDED AT PURCHASE PRICE OR ESTIMATED FAIR MARKET VALUE IF ACQUIRED BY DONATION. EASEMENTS ARE INCLUDED IN SANCTUARY LAND IN THE STATEMENT OF FINANCIAL POSITION.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>SCHEDULE D, PAGE 2, PART V, LINE 4</FormAndLineReferenceDesc>
        <ExplanationTxt>ALL GIFTS WHICH A DONOR HAS SPECIFIED AS FOR ENDOWMENT ARE RECORDED AS PERMANENTLY RESTRICTED ENDOWMENT AND BECOME PRINCIPAL WHICH IS NEVER EXPENDED. MARKET APPRECIATION ON PERMANENTLY RESTRICTED ENDOWMENT IS RECORDED AS UNAPPROPRIATED TEMPORARILY RESTRICTED ENDOWMENT APPRECIATION, WHILE APPRECIATION ON OTHER INVESTED FUNDS IS RECORDED AS BOARD DESIGNATED ENDOWMENT IN ACCORDANCE WITH BOARD POLICY. APPRECIATION ON ENDOWMENT GIFTS FOR SPECIFIC PURPOSES IS RECORDED IN TEMPORARILY RESTRICTED ENDOWMENT APPRECIATION FUNDS FOR THOSE PURPOSES. IT IS ASSOCIATION POLICY TO MAKE AN ANNUAL DRAW FOR OPERATIONS IN THE AMOUNT OF 5% OF THE AVERAGE MARKET VALUE OF ITS INVESTMENTS OVER THE TWELVE PRECEDING QUARTERS. AT THE BEGINNING OF EACH FISCAL YEAR, AN AMOUNT EQUAL TO 5% OF THE PERMANENTLY RESTRICTED ENDOWMENT IS TRANSFERRED FROM UNAPPROPRIATED TEMPORARILY RESTRICTED ENDOWMENT APPRECIATION TO APPROPRIATED TEMPORARILY RESTRICTED ENDOWMENT APPRECIATION, AND BECOMES AVAILABLE FOR EXPENDITURE. COSTS INCURRED FOR THE RESTRICTED PURPOSES ARE CHARGED THERETO. THE BOARD MAY APPROPRIATE ADDITIONAL FUNDS IN ADDITION TO THE 5% FOR SPENDING. IF THE SUM OF THE INCOME RECEIVED AND THE APPROPRIATION OF APPRECIATION EXCEEDS THE BUDGETED DRAW, SUFFICIENT INVESTMENT INCOME IS CREDITED TO BOARD DESIGNATED ENDOWMENT SO THAT THE TOTAL DRAW DOES NOT EXCEED 5%. FOR THE YEAR ENDED SEPTEMBER 30, 2024 THE DRAW WAS 371,560.</ExplanationTxt>
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        <ContributionCnt>3</ContributionCnt>
        <NoncashContributionsRptF990Amt>441000</NoncashContributionsRptF990Amt>
        <MethodOfDeterminingRevenuesTxt>FAIR MARKET VALUE</MethodOfDeterminingRevenuesTxt>
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        <Desc>LEGAL SERVICES</Desc>
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        <MethodOfDeterminingRevenuesTxt>HOURLY RATE</MethodOfDeterminingRevenuesTxt>
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      <AnyPropertyThatMustBeHeldInd>false</AnyPropertyThatMustBeHeldInd>
      <ReviewProcessUnusualNCGiftsInd>true</ReviewProcessUnusualNCGiftsInd>
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        <FormAndLineReferenceDesc>SCHEDULE M, PAGE 2, PART II</FormAndLineReferenceDesc>
        <ExplanationTxt>PART I - COLUMN B - THE ORGANIZATION IS REPORTING THE NUMBER OF CONTRIBUTIONS.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990 - ORGANIZATION'S MISSION</FormAndLineReferenceDesc>
        <ExplanationTxt>MNA'S PURPOSES ARE: (A) TO ACQUIRE, MAINTAIN, AND PROTECT NATURAL AREAS THAT PREDOMINANTLY CONTAIN EXAMPLES OF MICHIGAN FAUNA, FLORA, GEOLOGIC FEATURES, AND OTHER COMPONENTS AND ASPECTS OF THE NATURAL ENVIRONMENT OF MICHIGAN, INCLUDING HABITAT AND NATURAL COMMUNITIES FOR FISH, WILDLIFE AND PLANTS, IN THE STATE OF MICHIGAN. (B) TO CARRY ON A PROGRAM OF CONSERVATION STUDY AND EDUCATION.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PAGE 1, PART I, LINE 6</FormAndLineReferenceDesc>
        <ExplanationTxt>VOLUNTEERS ARE INVOLVED IN ACTIVITIES AT THE SANCTUARY LOCATIONS INCLUDING EVALUATION OF THE PROPERTIES AND RESIDENT SPECIES, MAINTAINING AND IMPROVING WILDLIFE HABITATS AND TRAILS, REMOVING INVASIVE SPECIES, PROVIDING TOURS AND EDUCATION TO THE PUBLIC. THE BOARD OF TRUSTEES ARE UNCOMPENSATED VOLUNTEERS. TRUSTEE VOLUNTEER HOURS PROVIDE A VARIETY OF VOLUNTARY SERVICES. TRUSTEE VOLUNTEER HOURS FOR THIS FISCAL YEAR WERE APPROXIMATELY 1,000 HOURS. MANAGEMENT ESTIMATED THAT THE NON-TRUSTEE VOLUNTEERS PROVIDED IS APPROXIMATELY 1,500 HOURS THIS FISCAL YEAR. NON- TRUSTEE VOLUNTEERS ALSO PROVIDE IMPORTANT CLERICAL ASSISTANCE IN THE ASSOCIATION OFFICE.</ExplanationTxt>
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      <SupplementalInformationDetail>
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        <ExplanationTxt>THE ORGANIZATION HAS MEMBERS.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PAGE 6, PART VI, LINE 7A</FormAndLineReferenceDesc>
        <ExplanationTxt>MEMBERS ELECT TRUSTEES.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PAGE 6, PART VI, LINE 7B</FormAndLineReferenceDesc>
        <ExplanationTxt>MEMBERS APPROVE ANY CHANGES TO THE ARTICLES OF INCORPORATION RECOMMENDED BY BOARD.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PAGE 6, PART VI, LINE 11B</FormAndLineReferenceDesc>
        <ExplanationTxt>THE EXECUTIVE DIRECTOR SHALL WORK WITH THE ORGANIZATION'S OUTSIDE ACCOUNTING AND AUDIT PROFESSIONALS TO PREPARE AN ACCURATE DRAFT IRS FORM 990. THE DRAFT FORM 990 SHALL BE FORWARDED TO THE BOARD BY E-MAIL FOR ITS REVIEW. IF NO OBJECTION IS RECEIVED WITHIN FIVE BUSINESS DAYS, THE FORM 990 SHALL BE FILED OR, IF AN OBJECTION IS RECEIVED, THEN THE BOARD SHALL REVIEW THE FORM 990 AT A REGULAR BOARD MEETING BEFORE IT IS FILED. THE EXECUTIVE DIRECTOR SHALL USE ALL REASONABLE EFFORTS TO ENSURE THAT THE ANNUAL FORM 990 IS ACCURATELY AND TIMELY COMPLETED,EXECUTED AND FILED, IDEALLY WITHOUT EXTENSIONS.</ExplanationTxt>
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        <ExplanationTxt>A CONFLICT OF INTEREST FORM IS COMPLETED ANNUALLY BY BOARD AND STAFF. ANYONE WITH A CONFLICT OF INTEREST MAY BE RECUSED FROM DISCUSSION AND CANNOT VOTE ON TOPICS INVOLVING THEIR CONFLICT OF INTEREST.</ExplanationTxt>
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        <FormAndLineReferenceDesc>FORM 990, PAGE 6, PART VI, LINE 15A</FormAndLineReferenceDesc>
        <ExplanationTxt>EXECUTIVE COMMITTEE EVALUATES AND RECOMMENDS EXECUTIVE DIRECTOR SALARY ANNUALLY. SALARIES FOR ALL OTHERS ARE ADOPTED BY THE BOARD AS PART OF THE ANNUAL OPERATING BUDGET PROCESS, SUBJECT TO LATER MODIFICATION BY THE BOARD.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PAGE 6, PART VI, LINE 19</FormAndLineReferenceDesc>
        <ExplanationTxt>AVAILABLE ELECTRONICALLY AND IN PERSON UPON REQUEST.</ExplanationTxt>
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</Return>