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        <AverageHoursPerWeek>1.00</AverageHoursPerWeek>
        <Officer>X</Officer>
        <ReportableCompFromOrganization>0</ReportableCompFromOrganization>
        <ReportableCompFromRelatedOrgs>0</ReportableCompFromRelatedOrgs>
        <OtherCompensation>0</OtherCompensation>
      </Form990PartVIISectionA>
      <Form990PartVIISectionA>
        <NamePerson>BENJAMIN TILGHMAN JR</NamePerson>
        <Title>BOARD MEMBER</Title>
        <AverageHoursPerWeek>1.00</AverageHoursPerWeek>
        <Officer>X</Officer>
        <ReportableCompFromOrganization>0</ReportableCompFromOrganization>
        <ReportableCompFromRelatedOrgs>0</ReportableCompFromRelatedOrgs>
        <OtherCompensation>0</OtherCompensation>
      </Form990PartVIISectionA>
      <Form990PartVIISectionA>
        <NamePerson>E BROOKE HARWOOD JR</NamePerson>
        <Title>BOARD MEMBER</Title>
        <AverageHoursPerWeek>1.00</AverageHoursPerWeek>
        <Officer>X</Officer>
        <ReportableCompFromOrganization>0</ReportableCompFromOrganization>
        <ReportableCompFromRelatedOrgs>0</ReportableCompFromRelatedOrgs>
        <OtherCompensation>0</OtherCompensation>
      </Form990PartVIISectionA>
      <Form990PartVIISectionA>
        <NamePerson>RICHARD C TILGHMAN JR</NamePerson>
        <Title>BOARD MEMBER</Title>
        <AverageHoursPerWeek>1.00</AverageHoursPerWeek>
        <Officer>X</Officer>
        <ReportableCompFromOrganization>0</ReportableCompFromOrganization>
        <ReportableCompFromRelatedOrgs>0</ReportableCompFromRelatedOrgs>
        <OtherCompensation>0</OtherCompensation>
      </Form990PartVIISectionA>
      <Form990PartVIISectionA>
        <NamePerson>R DOUGLAS JURRIUS</NamePerson>
        <Title>BOARD MEMBER</Title>
        <AverageHoursPerWeek>1.00</AverageHoursPerWeek>
        <Officer>X</Officer>
        <ReportableCompFromOrganization>0</ReportableCompFromOrganization>
        <ReportableCompFromRelatedOrgs>0</ReportableCompFromRelatedOrgs>
        <OtherCompensation>0</OtherCompensation>
      </Form990PartVIISectionA>
      <Form990PartVIISectionA>
        <NamePerson>BREENE M KERR</NamePerson>
        <Title>EMER BD MEMB</Title>
        <AverageHoursPerWeek>1.00</AverageHoursPerWeek>
        <Officer>X</Officer>
        <ReportableCompFromOrganization>0</ReportableCompFromOrganization>
        <ReportableCompFromRelatedOrgs>0</ReportableCompFromRelatedOrgs>
        <OtherCompensation>0</OtherCompensation>
      </Form990PartVIISectionA>
      <Form990PartVIISectionA>
        <NamePerson>RICHARD H KIMBERLY</NamePerson>
        <Title>BOARD MEMBER</Title>
        <AverageHoursPerWeek>1.00</AverageHoursPerWeek>
        <Officer>X</Officer>
        <ReportableCompFromOrganization>0</ReportableCompFromOrganization>
        <ReportableCompFromRelatedOrgs>0</ReportableCompFromRelatedOrgs>
        <OtherCompensation>0</OtherCompensation>
      </Form990PartVIISectionA>
      <Form990PartVIISectionA>
        <NamePerson>PETER M KREINDLER</NamePerson>
        <Title>BOARD MEMBER</Title>
        <AverageHoursPerWeek>1.00</AverageHoursPerWeek>
        <Officer>X</Officer>
        <ReportableCompFromOrganization>0</ReportableCompFromOrganization>
        <ReportableCompFromRelatedOrgs>0</ReportableCompFromRelatedOrgs>
        <OtherCompensation>0</OtherCompensation>
      </Form990PartVIISectionA>
      <Form990PartVIISectionA>
        <NamePerson>TED LEWERS</NamePerson>
        <Title>EMER BD MEMB</Title>
        <AverageHoursPerWeek>1.00</AverageHoursPerWeek>
        <Officer>X</Officer>
        <ReportableCompFromOrganization>0</ReportableCompFromOrganization>
        <ReportableCompFromRelatedOrgs>0</ReportableCompFromRelatedOrgs>
        <OtherCompensation>0</OtherCompensation>
      </Form990PartVIISectionA>
      <Form990PartVIISectionA>
        <NamePerson>FRED C MEENDSEN</NamePerson>
        <Title>EMER BD MEMB</Title>
        <AverageHoursPerWeek>1.00</AverageHoursPerWeek>
        <Officer>X</Officer>
        <ReportableCompFromOrganization>0</ReportableCompFromOrganization>
        <ReportableCompFromRelatedOrgs>0</ReportableCompFromRelatedOrgs>
        <OtherCompensation>0</OtherCompensation>
      </Form990PartVIISectionA>
      <Form990PartVIISectionA>
        <NamePerson>WILLIAM C MILLAR</NamePerson>
        <Title>BOARD MEMBER</Title>
        <AverageHoursPerWeek>1.00</AverageHoursPerWeek>
        <Officer>X</Officer>
        <ReportableCompFromOrganization>0</ReportableCompFromOrganization>
        <ReportableCompFromRelatedOrgs>0</ReportableCompFromRelatedOrgs>
        <OtherCompensation>0</OtherCompensation>
      </Form990PartVIISectionA>
      <Form990PartVIISectionA>
        <NamePerson>GEOFFREY F OXNAM</NamePerson>
        <Title>BOARD MEMBER</Title>
        <AverageHoursPerWeek>1.00</AverageHoursPerWeek>
        <Officer>X</Officer>
        <ReportableCompFromOrganization>0</ReportableCompFromOrganization>
        <ReportableCompFromRelatedOrgs>0</ReportableCompFromRelatedOrgs>
        <OtherCompensation>0</OtherCompensation>
      </Form990PartVIISectionA>
      <Form990PartVIISectionA>
        <NamePerson>SUMNER PARKER</NamePerson>
        <Title>EMER BD MEMB</Title>
        <AverageHoursPerWeek>1.00</AverageHoursPerWeek>
        <Officer>X</Officer>
        <ReportableCompFromOrganization>0</ReportableCompFromOrganization>
        <ReportableCompFromRelatedOrgs>0</ReportableCompFromRelatedOrgs>
        <OtherCompensation>0</OtherCompensation>
      </Form990PartVIISectionA>
      <Form990PartVIISectionA>
        <NamePerson>ROBERT A PERKINS</NamePerson>
        <Title>EMER BD MEMB</Title>
        <AverageHoursPerWeek>1.00</AverageHoursPerWeek>
        <Officer>X</Officer>
        <ReportableCompFromOrganization>0</ReportableCompFromOrganization>
        <ReportableCompFromRelatedOrgs>0</ReportableCompFromRelatedOrgs>
        <OtherCompensation>0</OtherCompensation>
      </Form990PartVIISectionA>
      <Form990PartVIISectionA>
        <NamePerson>JAMES K PETERSON</NamePerson>
        <Title>EMER BD MEMB</Title>
        <AverageHoursPerWeek>1.00</AverageHoursPerWeek>
        <Officer>X</Officer>
        <ReportableCompFromOrganization>0</ReportableCompFromOrganization>
        <ReportableCompFromRelatedOrgs>0</ReportableCompFromRelatedOrgs>
        <OtherCompensation>0</OtherCompensation>
      </Form990PartVIISectionA>
      <Form990PartVIISectionA>
        <NamePerson>NORMAN H PLUMMER</NamePerson>
        <Title>EMER BD MEMB</Title>
        <AverageHoursPerWeek>1.00</AverageHoursPerWeek>
        <Officer>X</Officer>
        <ReportableCompFromOrganization>0</ReportableCompFromOrganization>
        <ReportableCompFromRelatedOrgs>0</ReportableCompFromRelatedOrgs>
        <OtherCompensation>0</OtherCompensation>
      </Form990PartVIISectionA>
      <Form990PartVIISectionA>
        <NamePerson>LANGLEY RSHOOK</NamePerson>
        <Title>PRESIDENT</Title>
        <AverageHoursPerWeek>40.00</AverageHoursPerWeek>
        <Officer>X</Officer>
        <ReportableCompFromOrganization>123432</ReportableCompFromOrganization>
        <ReportableCompFromRelatedOrgs>0</ReportableCompFromRelatedOrgs>
        <OtherCompensation>0</OtherCompensation>
      </Form990PartVIISectionA>
      <Form990PartVIISectionA>
        <NamePerson>BRUCE A RAGSDALE</NamePerson>
        <Title>BOARD MEMBER</Title>
        <AverageHoursPerWeek>1.00</AverageHoursPerWeek>
        <Officer>X</Officer>
        <ReportableCompFromOrganization>0</ReportableCompFromOrganization>
        <ReportableCompFromRelatedOrgs>0</ReportableCompFromRelatedOrgs>
        <OtherCompensation>0</OtherCompensation>
      </Form990PartVIISectionA>
      <Form990PartVIISectionA>
        <NamePerson>JOHN J ROBERTS</NamePerson>
        <Title>EMER BD MEMB</Title>
        <AverageHoursPerWeek>1.00</AverageHoursPerWeek>
        <Officer>X</Officer>
        <ReportableCompFromOrganization>0</ReportableCompFromOrganization>
        <ReportableCompFromRelatedOrgs>0</ReportableCompFromRelatedOrgs>
        <OtherCompensation>0</OtherCompensation>
      </Form990PartVIISectionA>
      <Form990PartVIISectionA>
        <NamePerson>HENRY H SPIRE</NamePerson>
        <Title>EMER BD MEMB</Title>
        <AverageHoursPerWeek>1.00</AverageHoursPerWeek>
        <Officer>X</Officer>
        <ReportableCompFromOrganization>0</ReportableCompFromOrganization>
        <ReportableCompFromRelatedOrgs>0</ReportableCompFromRelatedOrgs>
        <OtherCompensation>0</OtherCompensation>
      </Form990PartVIISectionA>
      <Form990PartVIISectionA>
        <NamePerson>HENRY STANSBURY</NamePerson>
        <Title>BOARD MEMBER</Title>
        <AverageHoursPerWeek>1.00</AverageHoursPerWeek>
        <Officer>X</Officer>
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        <ReportableCompFromRelatedOrgs>0</ReportableCompFromRelatedOrgs>
        <OtherCompensation>0</OtherCompensation>
      </Form990PartVIISectionA>
      <Form990PartVIISectionA>
        <NamePerson>JAMES E THOMAS</NamePerson>
        <Title>EMER BD MEMB</Title>
        <AverageHoursPerWeek>1.00</AverageHoursPerWeek>
        <Officer>X</Officer>
        <ReportableCompFromOrganization>0</ReportableCompFromOrganization>
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        <OtherCompensation>0</OtherCompensation>
      </Form990PartVIISectionA>
      <Form990PartVIISectionA>
        <NamePerson>BARBARA VINIAR</NamePerson>
        <Title>BOARD MEMBER</Title>
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        <Officer>X</Officer>
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        <ReportableCompFromRelatedOrgs>0</ReportableCompFromRelatedOrgs>
        <OtherCompensation>0</OtherCompensation>
      </Form990PartVIISectionA>
      <Form990PartVIISectionA>
        <NamePerson>ANNA WFICHTNER</NamePerson>
        <Title>BOARD MEMBER</Title>
        <AverageHoursPerWeek>1.00</AverageHoursPerWeek>
        <Officer>X</Officer>
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        <ReportableCompFromRelatedOrgs>0</ReportableCompFromRelatedOrgs>
        <OtherCompensation>0</OtherCompensation>
      </Form990PartVIISectionA>
      <Form990PartVIISectionA>
        <NamePerson>JOAN DARBY WEST</NamePerson>
        <Title>EMER BD MEMB</Title>
        <AverageHoursPerWeek>1.00</AverageHoursPerWeek>
        <Officer>X</Officer>
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        <OtherCompensation>0</OtherCompensation>
      </Form990PartVIISectionA>
      <Form990PartVIISectionA>
        <NamePerson>DONALD G WHITCOMB</NamePerson>
        <Title>EMER BDMEMBE</Title>
        <AverageHoursPerWeek>1.00</AverageHoursPerWeek>
        <Officer>X</Officer>
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        <OtherCompensation>0</OtherCompensation>
      </Form990PartVIISectionA>
      <TotalReportableCompFromOrg>123432</TotalReportableCompFromOrg>
      <NumberIndividualsGT100K>1</NumberIndividualsGT100K>
      <FormersListed>false</FormersListed>
      <TotalCompGT150K>false</TotalCompGT150K>
      <CompensationFromOtherSources>false</CompensationFromOtherSources>
      <ContractorCompensation>
        <NameOfContractor>
          <NameBusiness>
            <BusinessNameLine1>HI-TIDE MARINE CONSTRUCTION INC</BusinessNameLine1>
          </NameBusiness>
        </NameOfContractor>
        <AddressOfContractor>
          <AddressUS>
            <AddressLine1>4505 PUBLIC LANDING</AddressLine1>
            <City>SNOW HILL</City>
            <State>MD</State>
            <ZIPCode>21863</ZIPCode>
          </AddressUS>
        </AddressOfContractor>
        <DescriptionOfServices>DESIGN &amp; INSTAL</DescriptionOfServices>
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      </ContractorCompensation>
      <NumberOfContractorsGT100K>1</NumberOfContractorsGT100K>
      <FundraisingEvents>173727</FundraisingEvents>
      <GovernmentGrants>230572</GovernmentGrants>
      <AllOtherContributions>1658126</AllOtherContributions>
      <NoncashContributions>377103</NoncashContributions>
      <TotalContributions>2062425</TotalContributions>
      <ProgramServiceRevenue>
        <Description>GENERAL ADMISSIONS</Description>
        <BusinessCode>712110</BusinessCode>
        <TotalRevenueColumn>506842</TotalRevenueColumn>
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      </ProgramServiceRevenue>
      <ProgramServiceRevenue>
        <Description>MEMBERSHIP DUES</Description>
        <BusinessCode>712110</BusinessCode>
        <TotalRevenueColumn>421522</TotalRevenueColumn>
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      </ProgramServiceRevenue>
      <ProgramServiceRevenue>
        <Description>EDUCATIONAL PROGRAMS</Description>
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        <Real>186734</Real>
      </GrossRents>
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      </LessRentalExpenses>
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        <TotalRevenueColumn>-24092</TotalRevenueColumn>
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        <Other>89987</Other>
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      <CntrbtnsRprtdFundraisingEvents>173727</CntrbtnsRprtdFundraisingEvents>
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        <TotalRevenueColumn>133663</TotalRevenueColumn>
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      </NetIncomeOrLoss>
      <OtherRevenueMisc>
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      </OtherRevenueMisc>
      <OtherRevenueMisc>
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      <GrantsToDomesticOrgs>
        <Total>3950</Total>
        <ProgramServices>3950</ProgramServices>
      </GrantsToDomesticOrgs>
      <CompCurrentOfficersDirectors>
        <Total>123432</Total>
        <ProgramServices>98436</ProgramServices>
        <ManagementAndGeneral>21277</ManagementAndGeneral>
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      </CompCurrentOfficersDirectors>
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        <ProgramServices>1097003</ProgramServices>
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      <PensionPlanContributions>
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        <ProgramServices>37395</ProgramServices>
        <ManagementAndGeneral>8938</ManagementAndGeneral>
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      </PensionPlanContributions>
      <OtherEmployeeBenefits>
        <Total>4350</Total>
        <ProgramServices>4350</ProgramServices>
      </OtherEmployeeBenefits>
      <PayrollTaxes>
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        <ProgramServices>87291</ProgramServices>
        <ManagementAndGeneral>30179</ManagementAndGeneral>
        <Fundraising>7010</Fundraising>
      </PayrollTaxes>
      <FeesForServicesLegal>
        <Total>4802</Total>
        <ManagementAndGeneral>4802</ManagementAndGeneral>
      </FeesForServicesLegal>
      <FeesForServicesAccounting>
        <Total>20850</Total>
        <ManagementAndGeneral>20850</ManagementAndGeneral>
      </FeesForServicesAccounting>
      <FeesForServicesProfFundraising>
        <Total>13089</Total>
        <Fundraising>13089</Fundraising>
      </FeesForServicesProfFundraising>
      <FeesForServicesInvstMgmntFees>
        <Total>38983</Total>
        <ManagementAndGeneral>38983</ManagementAndGeneral>
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      <FeesForServicesOther>
        <Total>14437</Total>
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        <ManagementAndGeneral>14412</ManagementAndGeneral>
      </FeesForServicesOther>
      <Advertising>
        <Total>82663</Total>
        <ProgramServices>69186</ProgramServices>
        <Fundraising>13477</Fundraising>
      </Advertising>
      <OfficeExpenses>
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        <Fundraising>2131</Fundraising>
      </Occupancy>
      <Travel>
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        <ManagementAndGeneral>5613</ManagementAndGeneral>
        <Fundraising>104</Fundraising>
      </Travel>
      <Interest>
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        <ManagementAndGeneral>37977</ManagementAndGeneral>
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      <DepreciationDepletion>
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        <ProgramServices>760603</ProgramServices>
        <ManagementAndGeneral>18923</ManagementAndGeneral>
        <Fundraising>18923</Fundraising>
      </DepreciationDepletion>
      <Insurance>
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        <ManagementAndGeneral>10392</ManagementAndGeneral>
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      </Insurance>
      <OtherExpenses>
        <Description>EXHIBIT</Description>
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        <ProgramServices>115418</ProgramServices>
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      <OtherExpenses>
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        <Total>112000</Total>
        <ProgramServices>112000</ProgramServices>
      </OtherExpenses>
      <OtherExpenses>
        <Description>MISCELLANEOUS</Description>
        <Total>103187</Total>
        <ProgramServices>52538</ProgramServices>
        <ManagementAndGeneral>10426</ManagementAndGeneral>
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      </OtherExpenses>
      <OtherExpenses>
        <Description>SPECIAL EVENTS</Description>
        <Total>47470</Total>
        <Fundraising>47470</Fundraising>
      </OtherExpenses>
      <AllOtherExpenses>
        <Total>60756</Total>
        <ProgramServices>48979</ProgramServices>
        <ManagementAndGeneral>3497</ManagementAndGeneral>
        <Fundraising>8280</Fundraising>
      </AllOtherExpenses>
      <TotalFunctionalExpenses>
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        <ProgramServices>2943190</ProgramServices>
        <ManagementAndGeneral>498385</ManagementAndGeneral>
        <Fundraising>268818</Fundraising>
      </TotalFunctionalExpenses>
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        <EOY>44260</EOY>
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      <SavingsAndTempCashInvestments>
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      <InventoriesForSaleOrUse>
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      <TotalAssets>
        <BOY>23189678</BOY>
        <EOY>22759245</EOY>
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      <AccountsPayableAccruedExpenses>
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      <MortNotesPyblSecuredInvestProp>
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        <EOY>2000000</EOY>
      </MortNotesPyblSecuredInvestProp>
      <TotalLiabilities>
        <BOY>2265426</BOY>
        <EOY>2445525</EOY>
      </TotalLiabilities>
      <FollowSFAS117>X</FollowSFAS117>
      <UnrestrictedNetAssets>
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        <EOY>9302867</EOY>
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        <EOY>1908253</EOY>
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      <PermanentlyRestrictedNetAssets>
        <BOY>9037779</BOY>
        <EOY>9102600</EOY>
      </PermanentlyRestrictedNetAssets>
      <TotalNetAssetsFundBalances>
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        <EOY>20313720</EOY>
      </TotalNetAssetsFundBalances>
      <TotalLiabNetAssetsFundBalances>
        <BOY>23189678</BOY>
        <EOY>22759245</EOY>
      </TotalLiabNetAssetsFundBalances>
      <InfoInScheduleOPartXI>X</InfoInScheduleOPartXI>
      <ReconcilationRevenueExpenses>505653</ReconcilationRevenueExpenses>
      <ReconcilationOtherChanges>-1116185</ReconcilationOtherChanges>
      <MethodOfAccountingAccrual>X</MethodOfAccountingAccrual>
      <AccountantCompileOrReview>false</AccountantCompileOrReview>
      <FSAudited>true</FSAudited>
      <AuditCommittee>true</AuditCommittee>
      <FinancialStatementConsolidated>X</FinancialStatementConsolidated>
      <FederalGrantAuditRequired>false</FederalGrantAuditRequired>
    </IRS990>
    <IRS990ScheduleA documentId="RetDoc3">
      <PubliclySupportedOrg509a2>X</PubliclySupportedOrg509a2>
      <GiftsGrantsContribReceived509>
        <CurrentTaxYearMinus4Years>2460825</CurrentTaxYearMinus4Years>
        <CurrentTaxYearMinus3Years>1875685</CurrentTaxYearMinus3Years>
        <CurrentTaxYearMinus2Years>1825839</CurrentTaxYearMinus2Years>
        <CurrentTaxYearMinus1Year>1567360</CurrentTaxYearMinus1Year>
        <CurrentTaxYear>2044110</CurrentTaxYear>
        <Total>9773819</Total>
      </GiftsGrantsContribReceived509>
      <GrossReceiptsFromAdmissions>
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      <RevenueSubtotal>4216046</RevenueSubtotal>
      <TotalRevenuePerForm990>4216046</TotalRevenuePerForm990>
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      <ExpensesNotRptdF990>342555</ExpensesNotRptdF990>
      <ExpensesSubtotal>3710393</ExpensesSubtotal>
      <TotalExpensesPerForm990>3710393</TotalExpensesPerForm990>
      <Form990ScheduleDPartXIV>
        <Identifier>ACCOUNTING FOR CONSERVATION EASEMENTS</Identifier>
        <ReturnReference>SCHEDULE D, PAGE 1, PART II, LINE 9</ReturnReference>
        <Explanation>THE STATE OF MARYLAND RETAINS A HISTORICAL EASEMENT ON A SMALL BOAT SHED. THE SMALL BOAT SHED IS REPORTED ON THE STATEMENT OF FINANCIAL POSITION AT COST AND IS DEPRECIATED OVER ITS ESTIMATED USEFUL LIFE BY A LEVEL CHARGE (STRAIGHT-LINE METHOD) TO FIXED ASSET FUND EXPENDITURES. THE SMALL BOAT SHED IS FULLY DEPRECIATED AS OF 4/30/12.</Explanation>
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      <Form990ScheduleDPartXIV>
        <Identifier>INTENDED USES FOR ENDOWMENT FUNDS</Identifier>
        <ReturnReference>SCHEDULE D, PAGE 2, PART V, LINE 4</ReturnReference>
        <Explanation>THE ENDOWMENT IS INTENDED TO BE USED FOR THE OBJECTIVES AND PURPOSES OF THE MUSEUM. NAMED FUNDS ARE ESTABLISHED WITHIN THE ENDOWMENT TO FIT SPECIFIC PURPOSES SUCH AS WATERFOWL, MAINTENANCE, LIGHTHOUSE, EDUCATION ETC., WHICH MEET THESE PURPOSES AND OBJECTIVES.</Explanation>
      </Form990ScheduleDPartXIV>
      <Form990ScheduleDPartXIV>
        <Identifier>LIABILITY UNDER FIN 48 FOOTNOTE</Identifier>
        <ReturnReference>SCHEDULE D, PAGE 3, PART X</ReturnReference>
        <Explanation>THE MUSEUM ADOPTED FASB ASC 740, WHICH PRESENTED A COMPREHENSIVE MODEL FOR HOW AN ENTITY SHOULD MEASURE, RECOGNIZE, PRESENT AND DISCLOSE IN ITS FINANCIAL STATEMENTS UNCERTAIN TAX POSITIONS THAT THE MUSEUM HAS TAKEN OR EXPECTS TO TAKE ON A TAX RETURN AS OF MAY 1, 2009. UNDER THIS STANDARD, THE MUSEUM RECOGNIZES THE TAX BENEFITS FROM UNCERTAIN TAX POSITIONS ONLY IF IT IS MORE LIKELY THAN NOT THAT THE TAX POSITION WILL BE SUSTAINED ON EXAMINATION BY THE TAXING AUTHORITIES, BASED ON THE TECHNICAL MERITS OF THE POSITION. THE TAX BENEFITS RECOGNIZED IN THE FINANCIAL STATEMENTS FROM SUCH POSITION ARE MEASURED BASED ON THE LARGEST BENEFIT THAT HAS A GREATER THAN 50 PERCENT LIKELIHOOD OF BEING REALIZED UPON ULTIMATE SETTLEMENT. FOR THE YEARS ENDED APRIL 30, 2012 AND 2011, THE MUSEUM HAS DOCUMENTED ITS CONSIDERATION OF FASB ASC 740-10 AND DETERMINED THAT NO MATERIAL UNCERTAIN POSITIONS QUALIFY FOR EITHER RECOGNITION OR DISCLOSURE IN THE FINANCIAL STATEMENTS. THE MUSEUM'S INCOME TAX FILINGS ARE SUBJECT TO AUDIT BY THE IRS AND MARYLAND. THE MUSEUM'S OPEN AUDIT PERIODS ARE 2009-2011.</Explanation>
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      <Form990ScheduleDPartXIV>
        <Identifier>RECONCILIATION OF CHANGES - OTHER</Identifier>
        <ReturnReference>SCHEDULE D, PAGE 4, PART XI, LINE 8</ReturnReference>
        <Explanation>SPECIAL EVENT, NETTED ON RETURN 131,729 RENTAL EXPENSES, NETTED ON RETURN 210,826 SPECIAL EVENT, NETTED ON RETURN -131,729 RENTAL EXPENSES, NETTED ON RETURN -210,826</Explanation>
      </Form990ScheduleDPartXIV>
      <Form990ScheduleDPartXIV>
        <Identifier>REVENUE AMOUNTS INCLUDED IN FINANCIALS - OTHER</Identifier>
        <ReturnReference>SCHEDULE D, PAGE 4, PART XII, LINE 2D</ReturnReference>
        <Explanation>SPECIAL EVENT, NETTED ON RETURN 131,729 RENTAL EXPENSES, NETTED ON RETURN 210,826</Explanation>
      </Form990ScheduleDPartXIV>
      <Form990ScheduleDPartXIV>
        <Identifier>EXPENSE AMOUNTS INCLUDED IN FINANCIALS - OTHER</Identifier>
        <ReturnReference>SCHEDULE D, PAGE 4, PART XIII, LINE 2D</ReturnReference>
        <Explanation>SPECIAL EVENT, NETTED ON RETURN 131,729 RENTAL EXPENSES, NETTED ON RETURN 210,826</Explanation>
      </Form990ScheduleDPartXIV>
    </IRS990ScheduleD>
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      <EventsInformation>
        <NameOfEvent1>BOATING PARTY</NameOfEvent1>
        <GrossReceiptsEvent1>305456</GrossReceiptsEvent1>
        <CharitableContributionsEvent1>173727</CharitableContributionsEvent1>
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        <RentFacilityCostsEvent1>28713</RentFacilityCostsEvent1>
        <FoodAndBeverageEvent1>71028</FoodAndBeverageEvent1>
        <EntertainmentEvent1>12400</EntertainmentEvent1>
        <OtherDirectExpensesEvent1>19588</OtherDirectExpensesEvent1>
        <GrossReceiptsTotal>305456</GrossReceiptsTotal>
        <CharitableContributionsTotal>173727</CharitableContributionsTotal>
        <GrossRevenueTotalEvents>131729</GrossRevenueTotalEvents>
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        <FoodAndBeverageTotalEvents>71028</FoodAndBeverageTotalEvents>
        <EntertainmentTotalEvents>12400</EntertainmentTotalEvents>
        <OtherDirectExpensesTotalEvents>19588</OtherDirectExpensesTotalEvents>
        <DirectExpenseSummaryEvents>131729</DirectExpenseSummaryEvents>
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        <NonCashCheckbox>X</NonCashCheckbox>
        <NumberOfContributions>81</NumberOfContributions>
        <NoncashContribsRptdF990>333252</NoncashContribsRptdF990>
        <MethodOfDeterminingRevenues>SELLING PRICE OF DONATION</MethodOfDeterminingRevenues>
      </BoatsAndPlanes>
      <SecuritiesPubliclyTraded>
        <NonCashCheckbox>X</NonCashCheckbox>
        <NumberOfContributions>5</NumberOfContributions>
        <NoncashContribsRptdF990>43851</NoncashContribsRptdF990>
        <MethodOfDeterminingRevenues>SELLING PRICE OF DONATION</MethodOfDeterminingRevenues>
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      <AnyPropertyThatMustBeHeld>false</AnyPropertyThatMustBeHeld>
      <ReviewProcessUnusualNCGifts>true</ReviewProcessUnusualNCGifts>
      <ThirdPartiesUsed>false</ThirdPartiesUsed>
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      <GeneralExplanation>
        <Identifier>ORGANIZATION'S MISSION</Identifier>
        <ReturnReference>FORM 990 - ORGANIZATION'S MISSION</ReturnReference>
        <Explanation>THE MISSION OF THE CHESAPEAKE BAY MARITIME MUSEUM IS TO INSPIRE AN UNDERSTANDING OF AND APPRECIATION FOR THE RICH MARITIME HERITAGE OF THE CHESAPEAKE BAY AND ITS TIDAL REACHES, TOGETHER WITH THE ARTIFACTS, CULTURES, AND CONNECTIONS BETWEEN THIS PLACE AND ITS PEOPLE. THE VISION OF THE CHESAPEAKE BAY MARITIME MUSEUM IS TO BE THE PREMIER MARITIME MUSEUM FOR STUDYING, EXHIBITING, PRESERVING, AND CELEBRATING THE IMPORTANT HISTORY AND CULTURE OF THE LARGEST ESTUARY IN THE UNITED STATES, THE CHESAPEAKE BAY. CBMM IS ACKNOWLEDGED AS A LEADING CENTER FOR EDUCATION, EXHIBITION, AND PRESERVATION OF CHESAPEAKE BAY MARITIME CULTURES. CBMM INSPIRES CULTURAL STEWARDSHIP BY PRESERVING, DOCUMENTING, AND SHARING STORIES, ARTIFACTS, SKILLS, AND THE TRADITIONS OF THE GENERATIONS OF PEOPLE WHO HAVE LIVED AND WORKED IN THE CHESAPEAKE BAY REGION. CBMM EMPHASIZES HOW THE CONNECTIONS BETWEEN PEOPLE AND THE BAY'S NATURAL ENVIRONMENT HAVE SHAPED UNIQUE, TRADITIONAL CULTURES. CBMM PROVIDES OPPORTUNITIES FOR VISITORS TO MAKE CONNECTIONS BETWEEN PAST HUMAN ACTIVITIES, PRESENT CONDITIONS, AND FUTURE POSSIBILITIES.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <Identifier>ELECTION OF MEMBERS AND THEIR RIGHTS</Identifier>
        <ReturnReference>FORM 990, PAGE 6, PART VI, LINE 7A</ReturnReference>
        <Explanation>THE BOARD OF GOVERNORS, WHO ARE ALSO MEMBERS, ARE THE ONLY BODY THAT HAS THE AUTHORITY TO ELECT NEW GOVERNORS.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <Identifier>ORGANIZATION'S PROCESS USED TO REVIEW FORM 990</Identifier>
        <ReturnReference>FORM 990, PAGE 6, PART VI, LINE 11B</ReturnReference>
        <Explanation>A DRAFT OF FORM 990 IS PROVIDED BY THE ORGANIZATION'S RETURN PREPARER TO THE ORGANIZATION'S VICE PRESIDENT OF FINANCE WHO REVIEWS THE DRAFT ALONG WITH THE BOARD AND FORWARDS ANY CHANGES TO THE PREPARER.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <Identifier>ENFORCEMENT OF CONFLICTS POLICY</Identifier>
        <ReturnReference>FORM 990, PAGE 6, PART VI, LINE 12C</ReturnReference>
        <Explanation>BOARD MEMBERS ARE REQUIRED ONCE A YEAR TO COMPLETE A CONFLICT OF INTEREST FORM DISCLOSING ANY RELATIONSHIPS WITH THE MUSEUM, NEW BOARD MEMBERS AND KEY EMPLOYEES ARE ALSO REQUIRED TO COMPLETE THIS FORM.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <Identifier>GOVERNING DOCUMENTS DISCLOSURE EXPLANATION</Identifier>
        <ReturnReference>FORM 990, PAGE 6, PART VI, LINE 19</ReturnReference>
        <Explanation>ITEMS MENTIONED IN LINE 19 ARE AVAILABLE UPON REQUEST. ANNUAL REPORT IS ON THE ORGANIZATION'S WEBSITE.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <Identifier>OTHER CHANGES IN NET ASSETS EXPLANATION</Identifier>
        <ReturnReference>FORM 990, PART XI, LINE 5</ReturnReference>
        <Explanation>THE OTHER CHANGE IN NET ASSETS OR FUND BALANCE IS DUE TO THE UNREALIZED LOSS OF -1,116,185.</Explanation>
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</Return>