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        <UnrelatedBusinessRevenueAmt>0</UnrelatedBusinessRevenueAmt>
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        <UnrelatedBusinessRevenueAmt>0</UnrelatedBusinessRevenueAmt>
        <ExclusionAmt>0</ExclusionAmt>
      </IncmFromInvestBondProceedsGrp>
      <RoyaltiesRevenueGrp>
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        <UnrelatedBusinessRevenueAmt>0</UnrelatedBusinessRevenueAmt>
        <ExclusionAmt>0</ExclusionAmt>
      </RoyaltiesRevenueGrp>
      <GrossRentsGrp>
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        <PersonalAmt>0</PersonalAmt>
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      <LessRentalExpensesGrp>
        <RealAmt>28660</RealAmt>
        <PersonalAmt>0</PersonalAmt>
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      <RentalIncomeOrLossGrp>
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        <PersonalAmt>0</PersonalAmt>
      </RentalIncomeOrLossGrp>
      <NetRentalIncomeOrLossGrp>
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        <UnrelatedBusinessRevenueAmt>0</UnrelatedBusinessRevenueAmt>
        <ExclusionAmt>0</ExclusionAmt>
      </NetRentalIncomeOrLossGrp>
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        <OtherAmt>0</OtherAmt>
      </LessCostOthBasisSalesExpnssGrp>
      <GainOrLossGrp>
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      <NetGainOrLossInvestmentsGrp>
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        <RelatedOrExemptFuncIncomeAmt>0</RelatedOrExemptFuncIncomeAmt>
        <UnrelatedBusinessRevenueAmt>0</UnrelatedBusinessRevenueAmt>
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      <ContriRptFundraisingEventAmt>0</ContriRptFundraisingEventAmt>
      <FundraisingDirectExpensesAmt>0</FundraisingDirectExpensesAmt>
      <NetIncmFromFundraisingEvtGrp>
        <TotalRevenueColumnAmt>0</TotalRevenueColumnAmt>
        <UnrelatedBusinessRevenueAmt>0</UnrelatedBusinessRevenueAmt>
        <ExclusionAmt>0</ExclusionAmt>
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      <GamingGrossIncomeAmt>0</GamingGrossIncomeAmt>
      <GamingDirectExpensesAmt>0</GamingDirectExpensesAmt>
      <NetIncomeFromGamingGrp>
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        <UnrelatedBusinessRevenueAmt>0</UnrelatedBusinessRevenueAmt>
        <ExclusionAmt>0</ExclusionAmt>
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      <NetIncomeOrLossGrp>
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        <RelatedOrExemptFuncIncomeAmt>45720</RelatedOrExemptFuncIncomeAmt>
        <UnrelatedBusinessRevenueAmt>0</UnrelatedBusinessRevenueAmt>
        <ExclusionAmt>0</ExclusionAmt>
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      <OtherRevenueMiscGrp>
        <Desc>Investment income</Desc>
        <TotalRevenueColumnAmt>277657</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>277657</RelatedOrExemptFuncIncomeAmt>
        <UnrelatedBusinessRevenueAmt>0</UnrelatedBusinessRevenueAmt>
        <ExclusionAmt>0</ExclusionAmt>
      </OtherRevenueMiscGrp>
      <OtherRevenueMiscGrp>
        <Desc>Unrealized Gain</Desc>
        <TotalRevenueColumnAmt>828417</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>828417</RelatedOrExemptFuncIncomeAmt>
        <UnrelatedBusinessRevenueAmt>0</UnrelatedBusinessRevenueAmt>
        <ExclusionAmt>0</ExclusionAmt>
      </OtherRevenueMiscGrp>
      <OtherRevenueMiscGrp>
        <Desc>Realized Gain</Desc>
        <TotalRevenueColumnAmt>53057</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>53057</RelatedOrExemptFuncIncomeAmt>
        <UnrelatedBusinessRevenueAmt>0</UnrelatedBusinessRevenueAmt>
        <ExclusionAmt>0</ExclusionAmt>
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      <MiscellaneousRevenueGrp>
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        <UnrelatedBusinessRevenueAmt>0</UnrelatedBusinessRevenueAmt>
        <ExclusionAmt>0</ExclusionAmt>
      </MiscellaneousRevenueGrp>
      <OtherRevenueTotalAmt>682873</OtherRevenueTotalAmt>
      <TotalRevenueGrp>
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        <RelatedOrExemptFuncIncomeAmt>1269673</RelatedOrExemptFuncIncomeAmt>
        <UnrelatedBusinessRevenueAmt>0</UnrelatedBusinessRevenueAmt>
        <ExclusionAmt>0</ExclusionAmt>
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      <GrantsToDomesticOrgsGrp>
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        <ProgramServicesAmt>0</ProgramServicesAmt>
      </GrantsToDomesticOrgsGrp>
      <GrantsToDomesticIndividualsGrp>
        <TotalAmt>35036</TotalAmt>
        <ProgramServicesAmt>35036</ProgramServicesAmt>
      </GrantsToDomesticIndividualsGrp>
      <ForeignGrantsGrp>
        <TotalAmt>0</TotalAmt>
        <ProgramServicesAmt>0</ProgramServicesAmt>
      </ForeignGrantsGrp>
      <BenefitsToMembersGrp>
        <TotalAmt>0</TotalAmt>
        <ProgramServicesAmt>0</ProgramServicesAmt>
      </BenefitsToMembersGrp>
      <CompCurrentOfcrDirectorsGrp>
        <TotalAmt>0</TotalAmt>
        <ProgramServicesAmt>0</ProgramServicesAmt>
        <ManagementAndGeneralAmt>0</ManagementAndGeneralAmt>
        <FundraisingAmt>0</FundraisingAmt>
      </CompCurrentOfcrDirectorsGrp>
      <CompDisqualPersonsGrp>
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        <ProgramServicesAmt>0</ProgramServicesAmt>
        <ManagementAndGeneralAmt>0</ManagementAndGeneralAmt>
        <FundraisingAmt>0</FundraisingAmt>
      </CompDisqualPersonsGrp>
      <OtherSalariesAndWagesGrp>
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        <ManagementAndGeneralAmt>132309</ManagementAndGeneralAmt>
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      <PensionPlanContributionsGrp>
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        <ProgramServicesAmt>0</ProgramServicesAmt>
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        <FundraisingAmt>0</FundraisingAmt>
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      <OtherEmployeeBenefitsGrp>
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        <ProgramServicesAmt>0</ProgramServicesAmt>
        <ManagementAndGeneralAmt>5209</ManagementAndGeneralAmt>
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      <PayrollTaxesGrp>
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        <FundraisingAmt>0</FundraisingAmt>
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      <FeesForServicesManagementGrp>
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      <FeesForServicesLegalGrp>
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        <ManagementAndGeneralAmt>42287</ManagementAndGeneralAmt>
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      </FeesForServicesLegalGrp>
      <FeesForServicesAccountingGrp>
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        <ManagementAndGeneralAmt>53085</ManagementAndGeneralAmt>
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      <FeesForServicesLobbyingGrp>
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      <FeesForServicesProfFundraising>
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      <FeesForSrvcInvstMgmntFeesGrp>
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      <AdvertisingGrp>
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        <FundraisingAmt>250</FundraisingAmt>
      </AdvertisingGrp>
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        <ManagementAndGeneralAmt>8102</ManagementAndGeneralAmt>
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        <ManagementAndGeneralAmt>30563</ManagementAndGeneralAmt>
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        <ManagementAndGeneralAmt>218</ManagementAndGeneralAmt>
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        <ManagementAndGeneralAmt>195275</ManagementAndGeneralAmt>
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      <TravelGrp>
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        <ManagementAndGeneralAmt>1206</ManagementAndGeneralAmt>
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      </TravelGrp>
      <PymtTravelEntrtnmntPubOfclGrp>
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      </PymtTravelEntrtnmntPubOfclGrp>
      <ConferencesMeetingsGrp>
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      <PaymentsToAffiliatesGrp>
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      <DepreciationDepletionGrp>
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      <OtherExpensesGrp>
        <Desc>Merchant Processing and Financial Fees</Desc>
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      <OtherExpensesGrp>
        <Desc>Postage</Desc>
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    </IRS990>
    <IRS990ScheduleA documentId="IRS990ScheduleA1" documentName="IRS990ScheduleA">
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        <CurrentTaxYearMinus3YearsAmt>0</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>0</CurrentTaxYearMinus2YearsAmt>
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      </GovtFurnSrvcFcltsVl509Grp>
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        <CurrentTaxYearMinus4YearsAmt>2381915</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>1735948</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>2908732</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>1470296</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>1696132</CurrentTaxYearAmt>
        <TotalAmt>10193023</TotalAmt>
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      <AmountsRcvdDsqlfyPersonGrp>
        <CurrentTaxYearMinus4YearsAmt>0</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>0</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>0</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>0</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>0</CurrentTaxYearAmt>
        <TotalAmt>0</TotalAmt>
      </AmountsRcvdDsqlfyPersonGrp>
      <SubstantialContributorsAmtGrp>
        <CurrentTaxYearMinus4YearsAmt>0</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>0</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>0</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>0</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>0</CurrentTaxYearAmt>
        <TotalAmt>0</TotalAmt>
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      <SubstAndDsqlfyPrsnsTotGrp>
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        <CurrentTaxYearMinus3YearsAmt>0</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>0</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>0</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>0</CurrentTaxYearAmt>
        <TotalAmt>0</TotalAmt>
      </SubstAndDsqlfyPrsnsTotGrp>
      <PublicSupportTotal509Amt>10193023</PublicSupportTotal509Amt>
      <GrossInvestmentIncome509Grp>
        <CurrentTaxYearMinus4YearsAmt>0</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>97747</CurrentTaxYearMinus3YearsAmt>
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        <CurrentTaxYearMinus1YearAmt>6203</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>98434</CurrentTaxYearAmt>
        <TotalAmt>346879</TotalAmt>
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      <Post1975UBTIGrp>
        <CurrentTaxYearMinus4YearsAmt>0</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>0</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>0</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>0</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>0</CurrentTaxYearAmt>
        <TotalAmt>0</TotalAmt>
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      <InvestmentIncomeAndUBTIGrp>
        <CurrentTaxYearMinus4YearsAmt>0</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>97747</CurrentTaxYearMinus3YearsAmt>
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        <CurrentTaxYearAmt>98434</CurrentTaxYearAmt>
        <TotalAmt>346879</TotalAmt>
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      <NetIncomeFromOtherUBIGrp>
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        <CurrentTaxYearMinus3YearsAmt>0</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>0</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>0</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>0</CurrentTaxYearAmt>
        <TotalAmt>0</TotalAmt>
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      <OtherIncome509Grp>
        <CurrentTaxYearMinus4YearsAmt>0</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>0</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>0</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>0</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>0</CurrentTaxYearAmt>
        <TotalAmt>0</TotalAmt>
      </OtherIncome509Grp>
      <TotalSupportCalendarYearGrp>
        <CurrentTaxYearMinus4YearsAmt>2381915</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>1833695</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>3053227</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>1476499</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>1794566</CurrentTaxYearAmt>
        <TotalAmt>10539902</TotalAmt>
      </TotalSupportCalendarYearGrp>
      <PublicSupportCY509Pct>0.9671</PublicSupportCY509Pct>
      <PublicSupportPY509Pct>0.9742</PublicSupportPY509Pct>
      <InvestmentIncomeCYPct>0.0329</InvestmentIncomeCYPct>
      <InvestmentIncomePYPct>0.0258</InvestmentIncomePYPct>
      <ThirtyThrPctSuprtTestsCY509Ind>X</ThirtyThrPctSuprtTestsCY509Ind>
    </IRS990ScheduleA>
    <IRS990ScheduleD documentId="IRS990ScheduleD1" documentName="IRS990ScheduleD">
      <LandGrp>
        <OtherCostOrOtherBasisAmt>1257641</OtherCostOrOtherBasisAmt>
        <BookValueAmt>1257641</BookValueAmt>
      </LandGrp>
      <BuildingsGrp>
        <OtherCostOrOtherBasisAmt>1765498</OtherCostOrOtherBasisAmt>
        <DepreciationAmt>890746</DepreciationAmt>
        <BookValueAmt>874752</BookValueAmt>
      </BuildingsGrp>
      <LeaseholdImprovementsGrp>
        <OtherCostOrOtherBasisAmt>766413</OtherCostOrOtherBasisAmt>
        <DepreciationAmt>297313</DepreciationAmt>
        <BookValueAmt>469100</BookValueAmt>
      </LeaseholdImprovementsGrp>
      <EquipmentGrp>
        <OtherCostOrOtherBasisAmt>883</OtherCostOrOtherBasisAmt>
        <BookValueAmt>883</BookValueAmt>
      </EquipmentGrp>
      <OtherLandBuildingsGrp>
        <OtherCostOrOtherBasisAmt>191685</OtherCostOrOtherBasisAmt>
        <DepreciationAmt>165520</DepreciationAmt>
        <BookValueAmt>26165</BookValueAmt>
      </OtherLandBuildingsGrp>
      <TotalBookValueLandBuildingsAmt>2628541</TotalBookValueLandBuildingsAmt>
      <OtherSecuritiesGrp>
        <Desc>Truist Director Fund</Desc>
        <BookValueAmt>1194069</BookValueAmt>
        <MethodValuationCd>F</MethodValuationCd>
      </OtherSecuritiesGrp>
      <OtherSecuritiesGrp>
        <Desc>Truist Restricted</Desc>
        <BookValueAmt>4646369</BookValueAmt>
        <MethodValuationCd>F</MethodValuationCd>
      </OtherSecuritiesGrp>
      <OtherSecuritiesGrp>
        <Desc>NSF Investment Accounts</Desc>
        <BookValueAmt>4551541</BookValueAmt>
        <MethodValuationCd>F</MethodValuationCd>
      </OtherSecuritiesGrp>
      <TotalBookValueSecuritiesAmt>10391979</TotalBookValueSecuritiesAmt>
      <OtherLiabilitiesOrgGrp>
        <Desc>Credit Cards</Desc>
        <Amt>2129</Amt>
      </OtherLiabilitiesOrgGrp>
      <OtherLiabilitiesOrgGrp>
        <Desc>Payroll Liabilities</Desc>
        <Amt>-2085</Amt>
      </OtherLiabilitiesOrgGrp>
      <OtherLiabilitiesOrgGrp>
        <Desc>Deferred Revenue</Desc>
        <Amt>34917</Amt>
      </OtherLiabilitiesOrgGrp>
      <OtherLiabilitiesOrgGrp>
        <Desc>Prepaid Ads for NSS News</Desc>
        <Amt>8856</Amt>
      </OtherLiabilitiesOrgGrp>
      <OtherLiabilitiesOrgGrp>
        <Desc>Venue Rental damage deposit</Desc>
        <Amt>3175</Amt>
      </OtherLiabilitiesOrgGrp>
      <OtherLiabilitiesOrgGrp>
        <Desc>Direct Deposit Payable</Desc>
        <Amt>688</Amt>
      </OtherLiabilitiesOrgGrp>
      <TotalLiabilityAmt>47680</TotalLiabilityAmt>
    </IRS990ScheduleD>
    <IRS990ScheduleI documentId="IRS990ScheduleI1" documentName="IRS990ScheduleI">
      <GrantsOtherAsstToIndivInUSGrp>
        <GrantTypeTxt>Education Science Travel</GrantTypeTxt>
        <RecipientCnt>33</RecipientCnt>
        <CashGrantAmt>35036</CashGrantAmt>
        <NonCashAssistanceAmt>0</NonCashAssistanceAmt>
        <ValuationMethodUsedDesc>0</ValuationMethodUsedDesc>
        <NonCashAssistanceDesc>0</NonCashAssistanceDesc>
      </GrantsOtherAsstToIndivInUSGrp>
    </IRS990ScheduleI>
    <IRS990ScheduleO documentId="IRS990ScheduleO1" documentName="IRS990ScheduleO">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part VI, Section B, Line 1</FormAndLineReferenceDesc>
        <ExplanationTxt>There is no difference</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part VI, Line 11b</FormAndLineReferenceDesc>
        <ExplanationTxt>No review was or will be conducted.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part VI, Line 19</FormAndLineReferenceDesc>
        <ExplanationTxt>Financial statements are provided with the Secretary-Treasurer report.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part III Line 4</FormAndLineReferenceDesc>
        <ExplanationTxt>| Explanation:| Member services bookstore fine art salon misc awards venue and other. We maintain a national headquarters and extensive library. We also provide awards for scientific research and conservation activities and grants to support exploration of caves scientific studies protection and conservation of caves and educational activities.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part IV Line 11</FormAndLineReferenceDesc>
        <ExplanationTxt>| Explanation:| No review was or will be conducted</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part VI Line 19</FormAndLineReferenceDesc>
        <ExplanationTxt>| Explanation:| Financials are provided with Secretary-Treasurer report on the website.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part IX Line 24</FormAndLineReferenceDesc>
        <ExplanationTxt>| Explanation:| Cave Ave Utilities $5006 Bad Debt $1200 Equipment $1298 Library and Museum $902 Sales Tax Exp $24 Facility rental and exp $28659</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
  </ReturnData>
</Return>