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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Nancy E Descano</PersonNm>
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        <ReportableCompFromOrgAmt>59342</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>11329</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Jennifer Adkins</PersonNm>
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        <ReportableCompFromOrgAmt>111048</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>8222</OtherCompensationAmt>
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      <TotalReportableCompFromOrgAmt>170390</TotalReportableCompFromOrgAmt>
      <TotReportableCompRltdOrgAmt>0</TotReportableCompRltdOrgAmt>
      <TotalOtherCompensationAmt>19551</TotalOtherCompensationAmt>
      <IndivRcvdGreaterThan100KCnt>1</IndivRcvdGreaterThan100KCnt>
      <FormerOfcrEmployeesListedInd>0</FormerOfcrEmployeesListedInd>
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      <CompensationFromOtherSrcsInd>0</CompensationFromOtherSrcsInd>
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      <FundraisingAmt>67392</FundraisingAmt>
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      <OtherRevenueMiscGrp>
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      <InfoInScheduleOPartIXInd>X</InfoInScheduleOPartIXInd>
      <CompCurrentOfcrDirectorsGrp>
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        <ProgramServicesAmt>114237</ProgramServicesAmt>
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      <CompDisqualPersonsGrp>
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        <ProgramServicesAmt>691154</ProgramServicesAmt>
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        <FundraisingAmt>78853</FundraisingAmt>
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      <PensionPlanContributionsGrp>
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        <ProgramServicesAmt>16183</ProgramServicesAmt>
        <ManagementAndGeneralAmt>4386</ManagementAndGeneralAmt>
        <FundraisingAmt>1585</FundraisingAmt>
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      <OtherEmployeeBenefitsGrp>
        <TotalAmt>86318</TotalAmt>
        <ProgramServicesAmt>63054</ProgramServicesAmt>
        <ManagementAndGeneralAmt>17090</ManagementAndGeneralAmt>
        <FundraisingAmt>6174</FundraisingAmt>
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      <PayrollTaxesGrp>
        <TotalAmt>83446</TotalAmt>
        <ProgramServicesAmt>60956</ProgramServicesAmt>
        <ManagementAndGeneralAmt>16522</ManagementAndGeneralAmt>
        <FundraisingAmt>5968</FundraisingAmt>
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      <FeesForServicesLegalGrp>
        <TotalAmt>1633</TotalAmt>
        <ManagementAndGeneralAmt>402</ManagementAndGeneralAmt>
        <FundraisingAmt>1231</FundraisingAmt>
      </FeesForServicesLegalGrp>
      <FeesForServicesAccountingGrp>
        <TotalAmt>53651</TotalAmt>
        <ManagementAndGeneralAmt>53651</ManagementAndGeneralAmt>
      </FeesForServicesAccountingGrp>
      <FeesForServicesOtherGrp>
        <TotalAmt>439569</TotalAmt>
        <ProgramServicesAmt>419755</ProgramServicesAmt>
        <ManagementAndGeneralAmt>19814</ManagementAndGeneralAmt>
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      <AdvertisingGrp>
        <TotalAmt>33060</TotalAmt>
        <ProgramServicesAmt>29760</ProgramServicesAmt>
        <ManagementAndGeneralAmt>1800</ManagementAndGeneralAmt>
        <FundraisingAmt>1500</FundraisingAmt>
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      <OfficeExpensesGrp>
        <TotalAmt>26824</TotalAmt>
        <ProgramServicesAmt>6412</ProgramServicesAmt>
        <ManagementAndGeneralAmt>18518</ManagementAndGeneralAmt>
        <FundraisingAmt>1894</FundraisingAmt>
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      <OccupancyGrp>
        <TotalAmt>101233</TotalAmt>
        <ProgramServicesAmt>71995</ProgramServicesAmt>
        <ManagementAndGeneralAmt>19492</ManagementAndGeneralAmt>
        <FundraisingAmt>9746</FundraisingAmt>
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      <TravelGrp>
        <TotalAmt>56144</TotalAmt>
        <ProgramServicesAmt>54615</ProgramServicesAmt>
        <ManagementAndGeneralAmt>770</ManagementAndGeneralAmt>
        <FundraisingAmt>759</FundraisingAmt>
      </TravelGrp>
      <ConferencesMeetingsGrp>
        <TotalAmt>1836</TotalAmt>
        <ProgramServicesAmt>1238</ProgramServicesAmt>
        <ManagementAndGeneralAmt>298</ManagementAndGeneralAmt>
        <FundraisingAmt>300</FundraisingAmt>
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      <DepreciationDepletionGrp>
        <TotalAmt>17461</TotalAmt>
        <ManagementAndGeneralAmt>17461</ManagementAndGeneralAmt>
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      <InsuranceGrp>
        <TotalAmt>14987</TotalAmt>
        <ProgramServicesAmt>3595</ProgramServicesAmt>
        <ManagementAndGeneralAmt>11392</ManagementAndGeneralAmt>
      </InsuranceGrp>
      <OtherExpensesGrp>
        <Desc>Direct Program Expenses</Desc>
        <TotalAmt>152831</TotalAmt>
        <ProgramServicesAmt>152831</ProgramServicesAmt>
      </OtherExpensesGrp>
      <OtherExpensesGrp>
        <Desc>Printing</Desc>
        <TotalAmt>92827</TotalAmt>
        <ProgramServicesAmt>80991</ProgramServicesAmt>
        <ManagementAndGeneralAmt>2218</ManagementAndGeneralAmt>
        <FundraisingAmt>9618</FundraisingAmt>
      </OtherExpensesGrp>
      <OtherExpensesGrp>
        <Desc>Sub-Grant Expenses</Desc>
        <TotalAmt>54385</TotalAmt>
        <ProgramServicesAmt>54385</ProgramServicesAmt>
      </OtherExpensesGrp>
      <OtherExpensesGrp>
        <Desc>Postage &amp; Delivery</Desc>
        <TotalAmt>29184</TotalAmt>
        <ProgramServicesAmt>24278</ProgramServicesAmt>
        <ManagementAndGeneralAmt>1602</ManagementAndGeneralAmt>
        <FundraisingAmt>3304</FundraisingAmt>
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      <AllOtherExpensesGrp>
        <TotalAmt>46265</TotalAmt>
        <ProgramServicesAmt>29267</ProgramServicesAmt>
        <ManagementAndGeneralAmt>15693</ManagementAndGeneralAmt>
        <FundraisingAmt>1305</FundraisingAmt>
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      <TotalFunctionalExpensesGrp>
        <TotalAmt>2416346</TotalAmt>
        <ProgramServicesAmt>1874706</ProgramServicesAmt>
        <ManagementAndGeneralAmt>419403</ManagementAndGeneralAmt>
        <FundraisingAmt>122237</FundraisingAmt>
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      <CashNonInterestBearingGrp>
        <BOYAmt>682499</BOYAmt>
        <EOYAmt>1150182</EOYAmt>
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      <SavingsAndTempCashInvstGrp>
        <BOYAmt>465848</BOYAmt>
        <EOYAmt>304126</EOYAmt>
      </SavingsAndTempCashInvstGrp>
      <PledgesAndGrantsReceivableGrp>
        <BOYAmt>527463</BOYAmt>
        <EOYAmt>583216</EOYAmt>
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      <PrepaidExpensesDefrdChargesGrp>
        <BOYAmt>13621</BOYAmt>
        <EOYAmt>28816</EOYAmt>
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      <LandBldgEquipCostOrOtherBssAmt>142103</LandBldgEquipCostOrOtherBssAmt>
      <LandBldgEquipAccumDeprecAmt>84872</LandBldgEquipAccumDeprecAmt>
      <LandBldgEquipBasisNetGrp>
        <BOYAmt>7854</BOYAmt>
        <EOYAmt>57231</EOYAmt>
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      <InvestmentsPubTradedSecGrp>
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        <EOYAmt>16765</EOYAmt>
      </InvestmentsPubTradedSecGrp>
      <IntangibleAssetsGrp>
        <BOYAmt>15075</BOYAmt>
        <EOYAmt>13405</EOYAmt>
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      <TotalAssetsGrp>
        <BOYAmt>1728399</BOYAmt>
        <EOYAmt>2153741</EOYAmt>
      </TotalAssetsGrp>
      <AccountsPayableAccrExpnssGrp>
        <BOYAmt>22757</BOYAmt>
        <EOYAmt>99166</EOYAmt>
      </AccountsPayableAccrExpnssGrp>
      <DeferredRevenueGrp>
        <BOYAmt>36349</BOYAmt>
        <EOYAmt>61191</EOYAmt>
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      <TotalLiabilitiesGrp>
        <BOYAmt>59106</BOYAmt>
        <EOYAmt>160357</EOYAmt>
      </TotalLiabilitiesGrp>
      <OrganizationFollowsSFAS117Ind>X</OrganizationFollowsSFAS117Ind>
      <UnrestrictedNetAssetsGrp>
        <BOYAmt>1349811</BOYAmt>
        <EOYAmt>1459105</EOYAmt>
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      <TemporarilyRstrNetAssetsGrp>
        <BOYAmt>319482</BOYAmt>
        <EOYAmt>534279</EOYAmt>
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      <TotalNetAssetsFundBalanceGrp>
        <BOYAmt>1669293</BOYAmt>
        <EOYAmt>1993384</EOYAmt>
      </TotalNetAssetsFundBalanceGrp>
      <TotLiabNetAssetsFundBalanceGrp>
        <BOYAmt>1728399</BOYAmt>
        <EOYAmt>2153741</EOYAmt>
      </TotLiabNetAssetsFundBalanceGrp>
      <ReconcilationRevenueExpnssAmt>324091</ReconcilationRevenueExpnssAmt>
      <OtherChangesInNetAssetsAmt>0</OtherChangesInNetAssetsAmt>
      <MethodOfAccountingAccrualInd>X</MethodOfAccountingAccrualInd>
      <AccountantCompileOrReviewInd>0</AccountantCompileOrReviewInd>
      <FSAuditedInd>1</FSAuditedInd>
      <FSAuditedBasisGrp>
        <SeparateBasisFinclStmtInd>X</SeparateBasisFinclStmtInd>
      </FSAuditedBasisGrp>
      <AuditCommitteeInd>1</AuditCommitteeInd>
      <FederalGrantAuditRequiredInd>1</FederalGrantAuditRequiredInd>
      <FederalGrantAuditPerformedInd>1</FederalGrantAuditPerformedInd>
    </IRS990>
    <IRS990ScheduleA documentId="RetDoc1039100001">
      <PublicOrganization170Ind>X</PublicOrganization170Ind>
      <GiftsGrantsContriRcvd170Grp>
        <CurrentTaxYearMinus4YearsAmt>1709516</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>1995462</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>1971081</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>1989753</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>2653026</CurrentTaxYearAmt>
        <TotalAmt>10318838</TotalAmt>
      </GiftsGrantsContriRcvd170Grp>
      <TotalCalendarYear170Grp>
        <CurrentTaxYearMinus4YearsAmt>1709516</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>1995462</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>1971081</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>1989753</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>2653026</CurrentTaxYearAmt>
        <TotalAmt>10318838</TotalAmt>
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      <PublicSupportTotal170Amt>10318838</PublicSupportTotal170Amt>
      <GrossInvestmentIncome170Grp>
        <CurrentTaxYearMinus4YearsAmt>6761</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>6287</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>5252</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>4095</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>5112</CurrentTaxYearAmt>
        <TotalAmt>27507</TotalAmt>
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      <OtherIncome170Grp>
        <CurrentTaxYearAmt>14650</CurrentTaxYearAmt>
        <TotalAmt>14650</TotalAmt>
      </OtherIncome170Grp>
      <TotalSupportAmt>10360995</TotalSupportAmt>
      <GrossReceiptsRltdActivitiesAmt>67649</GrossReceiptsRltdActivitiesAmt>
      <PublicSupportCY170Pct>0.99590</PublicSupportCY170Pct>
      <PublicSupportPY170Pct>0.99690</PublicSupportPY170Pct>
      <ThirtyThrPctSuprtTestsCY170Ind>X</ThirtyThrPctSuprtTestsCY170Ind>
    </IRS990ScheduleA>
    <IRS990ScheduleB documentId="RetDoc1234500001">
      <ContributorInformationGrp>
        <ContributorNum>RESTRICTED</ContributorNum>
        <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>
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    </IRS990ScheduleB>
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      <PaidStaffOrManagementInd>1</PaidStaffOrManagementInd>
      <MediaAdvertisementsInd>0</MediaAdvertisementsInd>
      <MailingsMembersInd>0</MailingsMembersInd>
      <PublicationsOrBroadcastInd>0</PublicationsOrBroadcastInd>
      <GrantsOtherOrganizationsInd>0</GrantsOtherOrganizationsInd>
      <DirectContactLegislatorsInd>1</DirectContactLegislatorsInd>
      <DirectContactLegislatorsAmt>1638</DirectContactLegislatorsAmt>
      <RalliesDemonstrationsInd>0</RalliesDemonstrationsInd>
      <OtherActivitiesInd>0</OtherActivitiesInd>
      <TotalLobbyingExpendituresAmt>1638</TotalLobbyingExpendituresAmt>
      <NotDescribedSection501c3Ind>0</NotDescribedSection501c3Ind>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part II-B, Line 1:</FormAndLineReferenceDesc>
        <ExplanationTxt>In 2016, PDE's lobbying activities consisted of communication by its Executive Director with elected/appointed officials by phone, email, and in person to express support for Federal funding for the National Estuary Program, Federal reauthorization of the National Estuary Program, Advancement of the Delaware River Bason Conservation Act in Congress, State of Delaware funding for the Delaware Estuary. The total expenses amount to $1,638 for 2016.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleC>
    <IRS990ScheduleD documentId="RetDoc1040000001">
      <EquipmentGrp>
        <OtherCostOrOtherBasisAmt>38511</OtherCostOrOtherBasisAmt>
        <DepreciationAmt>33453</DepreciationAmt>
        <BookValueAmt>5058</BookValueAmt>
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      <OtherLandBuildingsGrp>
        <OtherCostOrOtherBasisAmt>103592</OtherCostOrOtherBasisAmt>
        <DepreciationAmt>51419</DepreciationAmt>
        <BookValueAmt>52173</BookValueAmt>
      </OtherLandBuildingsGrp>
      <TotalBookValueLandBuildingsAmt>57231</TotalBookValueLandBuildingsAmt>
      <TotalRevEtcAuditedFinclStmtAmt>2768527</TotalRevEtcAuditedFinclStmtAmt>
      <OtherRevenueAmt>28090</OtherRevenueAmt>
      <RevenueNotReportedAmt>28090</RevenueNotReportedAmt>
      <RevenueSubtotalAmt>2740437</RevenueSubtotalAmt>
      <RevenueNotReportedFinclStmtAmt>0</RevenueNotReportedFinclStmtAmt>
      <TotalRevenuePerForm990Amt>2740437</TotalRevenuePerForm990Amt>
      <TotExpnsEtcAuditedFinclStmtAmt>2444436</TotExpnsEtcAuditedFinclStmtAmt>
      <OtherExpensesIncludedAmt>28090</OtherExpensesIncludedAmt>
      <ExpensesNotReportedAmt>28090</ExpensesNotReportedAmt>
      <ExpensesSubtotalAmt>2416346</ExpensesSubtotalAmt>
      <ExpensesNotRptFinclStmtAmt>0</ExpensesNotRptFinclStmtAmt>
      <TotalExpensesPerForm990Amt>2416346</TotalExpensesPerForm990Amt>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part XI, Line 2d - Other Adjustments:</FormAndLineReferenceDesc>
        <ExplanationTxt>Direct fundraising expenses netted against revenue in Form 990 -</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part XII, Line 2d - Other Adjustments:</FormAndLineReferenceDesc>
        <ExplanationTxt>Direct fundraising expenses netted against revenue in Form 990 -</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleD>
    <IRS990ScheduleG documentId="RetDoc1041300001">
      <FundraisingEventInformationGrp>
        <Event1Nm>Annual Event</Event1Nm>
        <GrossReceiptsEvent1Amt>95482</GrossReceiptsEvent1Amt>
        <CharitableContriEvent1Amt>67392</CharitableContriEvent1Amt>
        <GrossRevenueEvent1Amt>28090</GrossRevenueEvent1Amt>
        <OtherDirectExpensesEvent1Amt>28090</OtherDirectExpensesEvent1Amt>
        <GrossReceiptsTotalAmt>95482</GrossReceiptsTotalAmt>
        <CharitableContributionsTotAmt>67392</CharitableContributionsTotAmt>
        <GrossRevenueTotalEventsAmt>28090</GrossRevenueTotalEventsAmt>
        <OthDirectExpnssTotalEventsAmt>28090</OthDirectExpnssTotalEventsAmt>
        <DirectExpenseSummaryEventsAmt>28090</DirectExpenseSummaryEventsAmt>
        <NetIncomeSummaryAmt>0</NetIncomeSummaryAmt>
      </FundraisingEventInformationGrp>
    </IRS990ScheduleG>
    <IRS990ScheduleO documentId="RetDoc1044400001">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, line 11b</FormAndLineReferenceDesc>
        <ExplanationTxt>Form 990 is distributed to Board; the Executive Director, CFO and Executive committee review Form 990 prior to its filing.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, line 12c</FormAndLineReferenceDesc>
        <ExplanationTxt>Board members are asked annually to disclose any interests that could give rise to a conflict. The policy is regularly monitored by the Executive Director.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, line 15</FormAndLineReferenceDesc>
        <ExplanationTxt>The Partnership uses comparability data when determining the Executive Director's and key employees' salaries.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section C, line 19</FormAndLineReferenceDesc>
        <ExplanationTxt>Governing documents are available upon reequest at the PDE offices during regular business hours.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part IX, line 11g</FormAndLineReferenceDesc>
        <ExplanationTxt>Contracted services: Program service expenses 419,755. Management and general expenses 19,814. Fundraising expenses 0. Total expenses 439,569.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
  </ReturnData>
</Return>