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        <TotalRevenueColumnAmt>83604</TotalRevenueColumnAmt>
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        <UnrelatedBusinessRevenueAmt>0</UnrelatedBusinessRevenueAmt>
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      <ContriRptFundraisingEventAmt>112800</ContriRptFundraisingEventAmt>
      <FundraisingDirectExpensesAmt>18803</FundraisingDirectExpensesAmt>
      <NetIncmFromFundraisingEvtGrp>
        <TotalRevenueColumnAmt>129722</TotalRevenueColumnAmt>
        <UnrelatedBusinessRevenueAmt>0</UnrelatedBusinessRevenueAmt>
        <ExclusionAmt>129722</ExclusionAmt>
      </NetIncmFromFundraisingEvtGrp>
      <GrossSalesOfInventoryAmt>31033</GrossSalesOfInventoryAmt>
      <CostOfGoodsSoldAmt>22797</CostOfGoodsSoldAmt>
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        <RelatedOrExemptFuncIncomeAmt>8236</RelatedOrExemptFuncIncomeAmt>
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      <TotalRevenueGrp>
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        <RelatedOrExemptFuncIncomeAmt>403456</RelatedOrExemptFuncIncomeAmt>
        <UnrelatedBusinessRevenueAmt>0</UnrelatedBusinessRevenueAmt>
        <ExclusionAmt>392896</ExclusionAmt>
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      <CompCurrentOfcrDirectorsGrp>
        <TotalAmt>103060</TotalAmt>
        <ProgramServicesAmt>51530</ProgramServicesAmt>
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      <OtherSalariesAndWagesGrp>
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        <ProgramServicesAmt>905159</ProgramServicesAmt>
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      <AdvertisingGrp>
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        <FundraisingAmt>1132</FundraisingAmt>
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      <OfficeExpensesGrp>
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        <FundraisingAmt>5470</FundraisingAmt>
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      <InformationTechnologyGrp>
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        <FundraisingAmt>309</FundraisingAmt>
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        <FundraisingAmt>2301</FundraisingAmt>
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      <ConferencesMeetingsGrp>
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        <FundraisingAmt>80</FundraisingAmt>
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        <FundraisingAmt>834</FundraisingAmt>
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        <FundraisingAmt>2450</FundraisingAmt>
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      <OtherExpensesGrp>
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        <FundraisingAmt>2343</FundraisingAmt>
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        <EOYAmt>12059411</EOYAmt>
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      <AccountsPayableAccrExpnssGrp>
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        <EOYAmt>374117</EOYAmt>
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      <DeferredRevenueGrp>
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        <EOYAmt>301494</EOYAmt>
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      <OtherLiabilitiesGrp>
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        <EOYAmt>12322</EOYAmt>
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      <TotalLiabilitiesGrp>
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        <EOYAmt>687933</EOYAmt>
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      <OrganizationFollowsFASB117Ind>X</OrganizationFollowsFASB117Ind>
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        <EOYAmt>6857116</EOYAmt>
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      <DonorRestrictionNetAssetsGrp>
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        <EOYAmt>4514362</EOYAmt>
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        <EOYAmt>11371478</EOYAmt>
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      <TotLiabNetAssetsFundBalanceGrp>
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        <EOYAmt>12059411</EOYAmt>
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      <ReconcilationRevenueExpnssAmt>548270</ReconcilationRevenueExpnssAmt>
      <NetUnrlzdGainsLossesInvstAmt>255642</NetUnrlzdGainsLossesInvstAmt>
      <MethodOfAccountingAccrualInd>X</MethodOfAccountingAccrualInd>
      <AccountantCompileOrReviewInd>false</AccountantCompileOrReviewInd>
      <FSAuditedInd>true</FSAuditedInd>
      <FSAuditedBasisGrp>
        <SeparateBasisFinclStmtInd>X</SeparateBasisFinclStmtInd>
      </FSAuditedBasisGrp>
      <AuditCommitteeInd>true</AuditCommitteeInd>
      <FederalGrantAuditRequiredInd>false</FederalGrantAuditRequiredInd>
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      <PublicSupportCY509Pct>0</PublicSupportCY509Pct>
      <InvestmentIncomeCYPct>0</InvestmentIncomeCYPct>
      <Form990ScheduleAPartVIGrp>
        <FormAndLineReferenceDesc>Pt II Ln 10</FormAndLineReferenceDesc>
        <ExplanationTxt>Other Income Part II, Line 10 Description: ANNUAL FUNDRAISERS AND PPP 2020: 395905. 2021: 185710. 2022: 183505. 2023: 149192. 2024: 148525.</ExplanationTxt>
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    </IRS990ScheduleA>
    <IRS990ScheduleB documentId="IRS990ScheduleB-01">
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        <ContributorBusinessName>
          <BusinessNameLine1>RESTRICTED</BusinessNameLine1>
        </ContributorBusinessName>
        <ContributorUSAddress>
          <AddressLine1>RESTRICTED</AddressLine1>
          <AddressLine2>RESTRICTED</AddressLine2>
          <City>RESTRICTED</City>
          <State>RESTRICTED</State>
          <ZIPCode>RESTRICTED</ZIPCode>
        </ContributorUSAddress>
        <TotalContributionsAmt>RESTRICTED</TotalContributionsAmt>
      </ContributorInformationGrp>
    </IRS990ScheduleB>
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      <CYEndwmtFundGrp>
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        <InvestmentEarningsOrLossesAmt>346051</InvestmentEarningsOrLossesAmt>
        <OtherExpendituresAmt>159948</OtherExpendituresAmt>
        <EndYearBalanceAmt>3395894</EndYearBalanceAmt>
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      <CYMinus1YrEndwmtFundGrp>
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        <OtherExpendituresAmt>162627</OtherExpendituresAmt>
        <EndYearBalanceAmt>3209791</EndYearBalanceAmt>
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      <CYMinus2YrEndwmtFundGrp>
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        <EndYearBalanceAmt>2938595</EndYearBalanceAmt>
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      <CYMinus3YrEndwmtFundGrp>
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        <OtherExpendituresAmt>148721</OtherExpendituresAmt>
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      <BoardDesignatedBalanceEOYPct>0.23000</BoardDesignatedBalanceEOYPct>
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      <EndowmentsHeldUnrelatedOrgInd>true</EndowmentsHeldUnrelatedOrgInd>
      <EndowmentsHeldRelatedOrgInd>false</EndowmentsHeldRelatedOrgInd>
      <RelatedOrgListSchRInd>false</RelatedOrgListSchRInd>
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      <OtherLandBuildingsGrp>
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      <TotalLiabilityAmt>12322</TotalLiabilityAmt>
      <FootnoteTextInd>X</FootnoteTextInd>
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      <ExpensesSubtotalAmt>2163814</ExpensesSubtotalAmt>
      <InvestmentExpensesNotIncld2Amt>18200</InvestmentExpensesNotIncld2Amt>
      <ExpensesNotRptFinclStmtAmt>18200</ExpensesNotRptFinclStmtAmt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Pt V, Line 4</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ORGANIZATIONS ENDOWMENT FUNDS ARE USED TO GENERATE INVESTMENT INCOME TO BE USED FOR: PROMOTING AND CONTINUING THE LEGACY OF THE ORGANIZATIONS FIRST PROFESSIONAL NATURALIST AND EDUCATOR, ANDY LARSEN; MAINTENANCE AND UPKEEP OF THE EAST PROPERTY LOCATION; AND ENVIRONMENTAL EDUCATION AND OTHER NEEDS OF THE ORGANIZATION.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Pt X, Line 2</FormAndLineReferenceDesc>
        <ExplanationTxt>THE CENTERS CURRENT ACCOUNTING POLICY IS TO DISCLOSE LIABILITIES FOR UNCERTAIN TAX POSITIONS WHEN A LIABILITY IS PROBABLE AND ESTIMABLE. MANAGEMENT IS NOT AWARE OF ANY VIOLATION OF ITS TAX STATUS AS AN ORGANIZATION EXEMPT FROM INCOME TAXES, NOR IS IT AWARE OF ANY EXPOSURE TO UNRELATED BUSINESS INCOME TAX. THE CENTER FILES TAX RETURNS IN THE U.S. FEDERAL JURISDICTION AND THE STATE OF WISCONSIN. THE CENTER DOES NOT HAVE ANY TAX RETURNS CURRENTLY UNDER EXAMINATION BY A FEDERAL OR STATE JURISDICTION.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleD>
    <IRS990ScheduleG documentId="IRS990ScheduleG-01">
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        <CharitableContriEvent1Amt>56000</CharitableContriEvent1Amt>
        <GrossRevenueEvent1Amt>92545</GrossRevenueEvent1Amt>
        <RentFacilityCostsEvent1Amt>5194</RentFacilityCostsEvent1Amt>
        <FoodAndBeverageEvent1Amt>3455</FoodAndBeverageEvent1Amt>
        <Event2Nm>FROTHY FORAGE</Event2Nm>
        <GrossReceiptsEvent2Amt>32497</GrossReceiptsEvent2Amt>
        <CharitableContriEvent2Amt>14050</CharitableContriEvent2Amt>
        <GrossRevenueEvent2Amt>18447</GrossRevenueEvent2Amt>
        <RentFacilityCostsEvent2Amt>4648</RentFacilityCostsEvent2Amt>
        <FoodAndBeverageEvent2Amt>4524</FoodAndBeverageEvent2Amt>
        <OtherEventsTotalCnt>6</OtherEventsTotalCnt>
        <GrossReceiptsOtherEventsAmt>80283</GrossReceiptsOtherEventsAmt>
        <CharitableContriOtherEventsAmt>42750</CharitableContriOtherEventsAmt>
        <GrossRevenueOtherEventsAmt>37533</GrossRevenueOtherEventsAmt>
        <OthDirectExpnssOtherEventsAmt>982</OthDirectExpnssOtherEventsAmt>
        <GrossReceiptsTotalAmt>261325</GrossReceiptsTotalAmt>
        <CharitableContributionsTotAmt>112800</CharitableContributionsTotAmt>
        <GrossRevenueTotalEventsAmt>148525</GrossRevenueTotalEventsAmt>
        <RentFcltyCostsTotalEventsAmt>9842</RentFcltyCostsTotalEventsAmt>
        <FoodAndBeverageTotalEventsAmt>7979</FoodAndBeverageTotalEventsAmt>
        <OthDirectExpnssTotalEventsAmt>982</OthDirectExpnssTotalEventsAmt>
        <DirectExpenseSummaryEventsAmt>18803</DirectExpenseSummaryEventsAmt>
        <NetIncomeSummaryAmt>129722</NetIncomeSummaryAmt>
      </FundraisingEventInformationGrp>
    </IRS990ScheduleG>
    <IRS990ScheduleM documentId="IRS990ScheduleM-01">
      <OtherNonCashContriTableGrp>
        <NonCashCheckboxInd>X</NonCashCheckboxInd>
        <Desc>CONSTRUCTION</Desc>
        <ContributionCnt>1</ContributionCnt>
        <NoncashContributionsRptF990Amt>30000</NoncashContributionsRptF990Amt>
        <MethodOfDeterminingRevenuesTxt>FAIR MARKET VALUE</MethodOfDeterminingRevenuesTxt>
      </OtherNonCashContriTableGrp>
      <AnyPropertyThatMustBeHeldInd>false</AnyPropertyThatMustBeHeldInd>
      <ReviewProcessUnusualNCGiftsInd>true</ReviewProcessUnusualNCGiftsInd>
      <ThirdPartiesUsedInd>false</ThirdPartiesUsedInd>
    </IRS990ScheduleM>
    <IRS990ScheduleO documentId="IRS990ScheduleO-01" softwareId="24020153">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Pt VI, Line 11b</FormAndLineReferenceDesc>
        <ExplanationTxt>THE FINANCE COMMITTEE OF THE BOARD OF DIRECTORS, OR DESIGNATED BOARD OFFICER(S), WILL REVIEW THE FORM 990 PRIOR TO FILING. EITHER BEFORE OR AFTER FILING, THE FINANCE COMMITTEE OF THE BOARD WILL REPORT BACK TO THE FULL BOARD ON THE REVIEW OF THE 990.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Pt VI, Line 12c</FormAndLineReferenceDesc>
        <ExplanationTxt>EACH YEAR THE FULL ORGANIZATION BOARD OF DIRECTORS, AT AN OFFICIALLY CALLED MEETING, WILL REVIEW THE CONFLICT OF INTEREST POLICY; EACH BOARD MEMBER WILL THEN SIGN A STATEMENT OF COMPLIANCE WITH THE POLICY WHICH IS HELD ON RECORD. DISCLOSED BOARD CONFLICTS, IF ANY, WOULD BE REFERRED TO THE BOARDS EXECUTIVE COMMITTEE FOR REVIEW.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Pt VI, Line 15a</FormAndLineReferenceDesc>
        <ExplanationTxt>ANNAULLY THE BOARD PRESIDENT WILL ASK FOR FEEDBACK ON EXECUTIVE DIRECTOR PERFORMANCE FROM THE FULL BOARD OF DIRECTORS. THEN THE BOARDS EXECUTIVE COMMITTEE REVIEWS THE PERFORMANCE FEEDBACK AND SETS EQUITABLE EXECUTIVE DIRECTOR COMPENSATION.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Pt VI, Line 19</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ORGANIZATION WILL MAKE ITS GOVERNING DOCUMENTS, CONFLICT OF INTEREST POLICY, AND FINANCIAL STATEMENTS AVAILABLE TO THE PUBLIC AT ITS PRINCIPAL ADMINISTRATIVE OFFICES DURING NORMAL BUSINESS HOURS, AND IN RESPONSE TO WRITTEN REQUESTS RECEIVED AT ITS PRINCIPAL ADMINISTRATIVE OFFICES.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
  </ReturnData>
</Return>