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      <Form990PartVIISectionAGrp>
        <PersonNm>KRYS WEYAND</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>JENNIFER WRIGHT</PersonNm>
        <TitleTxt>EX-TRUSTEE</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>LUIS YZAGUIRRE III</PersonNm>
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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>MARSHA RANKIN</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>GERARDO MORALES</PersonNm>
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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
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      <GrossAmountSalesAssetsGrp>
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      <GainOrLossGrp>
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      <NetGainOrLossInvestmentsGrp>
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      <ContriRptFundraisingEventAmt>103625</ContriRptFundraisingEventAmt>
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      <NetIncmFromFundraisingEvtGrp>
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        <ExclusionAmt>-22677</ExclusionAmt>
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        <BusinessCd>712110</BusinessCd>
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      <OtherRevenueTotalAmt>9069</OtherRevenueTotalAmt>
      <TotalRevenueGrp>
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      <CompCurrentOfcrDirectorsGrp>
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        <ProgramServicesAmt>93072</ProgramServicesAmt>
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      <OtherEmployeeBenefitsGrp>
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      <PayrollTaxesGrp>
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        <ProgramServicesAmt>56808</ProgramServicesAmt>
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        <ProgramServicesAmt>3292</ProgramServicesAmt>
        <ManagementAndGeneralAmt>1382</ManagementAndGeneralAmt>
        <FundraisingAmt>535</FundraisingAmt>
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      <ConferencesMeetingsGrp>
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        <ManagementAndGeneralAmt>828</ManagementAndGeneralAmt>
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      <InsuranceGrp>
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        <ProgramServicesAmt>65293</ProgramServicesAmt>
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      <OtherExpensesGrp>
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        <ProgramServicesAmt>67725</ProgramServicesAmt>
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      <OtherExpensesGrp>
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        <ProgramServicesAmt>61931</ProgramServicesAmt>
        <ManagementAndGeneralAmt>536</ManagementAndGeneralAmt>
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      <OtherExpensesGrp>
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        <ManagementAndGeneralAmt>32801</ManagementAndGeneralAmt>
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      <AllOtherExpensesGrp>
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      <TotalFunctionalExpensesGrp>
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      <TotLiabNetAssetsFundBalanceGrp>
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        <ExplanationTxt>FUNDRAISING - 2013 AMOUNT: $ 87,760. 2014 AMOUNT: $ 97,100. 2015 AMOUNT: $ 78,856. 2016 AMOUNT: $ 74,421. 2017 AMOUNT: $ 94,026. MISCELLANEOUS - 2013 AMOUNT: $ 7,342. 2014 AMOUNT: $ 2,933. 2015 AMOUNT: $ 4,204. 2016 AMOUNT: $ 19,993. 2017 AMOUNT: $ 9,069.</ExplanationTxt>
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        <BookValueAmt>1230115</BookValueAmt>
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      </OtherLandBuildingsGrp>
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      <OtherLiabilitiesOrgGrp>
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        <Amt>46272</Amt>
      </OtherLiabilitiesOrgGrp>
      <TotalLiabilityAmt>46272</TotalLiabilityAmt>
      <TotalRevEtcAuditedFinclStmtAmt>2210007</TotalRevEtcAuditedFinclStmtAmt>
      <NetUnrealizedGainsInvstAmt>257762</NetUnrealizedGainsInvstAmt>
      <DonatedServicesAndUseFcltsAmt>58489</DonatedServicesAndUseFcltsAmt>
      <OtherRevenueAmt>175749</OtherRevenueAmt>
      <RevenueNotReportedAmt>492000</RevenueNotReportedAmt>
      <RevenueSubtotalAmt>1718007</RevenueSubtotalAmt>
      <InvestmentExpensesNotIncldAmt>32801</InvestmentExpensesNotIncldAmt>
      <RevenueNotReportedFinclStmtAmt>32801</RevenueNotReportedFinclStmtAmt>
      <TotalRevenuePerForm990Amt>1750808</TotalRevenuePerForm990Amt>
      <TotExpnsEtcAuditedFinclStmtAmt>1978045</TotExpnsEtcAuditedFinclStmtAmt>
      <DonatedServicesUseFcltsAmt>58489</DonatedServicesUseFcltsAmt>
      <OtherExpensesIncludedAmt>175749</OtherExpensesIncludedAmt>
      <ExpensesNotReportedAmt>234238</ExpensesNotReportedAmt>
      <ExpensesSubtotalAmt>1743807</ExpensesSubtotalAmt>
      <InvestmentExpensesNotIncld2Amt>32801</InvestmentExpensesNotIncld2Amt>
      <ExpensesNotRptFinclStmtAmt>32801</ExpensesNotRptFinclStmtAmt>
      <TotalExpensesPerForm990Amt>1776608</TotalExpensesPerForm990Amt>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART III, LINE 1A:</FormAndLineReferenceDesc>
        <ExplanationTxt>MOSTH MAINTAINS PERMANENT COLLECTIONS PERTAINING TO NORTHEASTERN MEXICO AND SOUTH TEXAS. THESE HOLDINGS ARE BOTH TWO AND THREE DIMENSIONAL ARTIFACTS RANGING FORM PREHISTORIC MATERIALS TO ITEMS OF CONTEMPORARY CULTURE. COLLECTION STRENGTHS INCLUDE NUMEROUS ARTIFACTS PERTAINING TO FARMING AND RANCHING WITH A LARGE PHOTOGRAPHIC ARCHIVE. MOSTH MAINTAINS, SEPARATE FROM THE PERMANENT COLLECTION, A COLLECTION OF ITEMS USED FOR HANDS-ON-ACTIVITIES OR OTHER EDUCATIONAL PURPOSES. IN COMFORMITY WITH INDUSTRY STANDARDS, HISTORICAL OBJECTS PURCHASED AND DONATED ARE NOT INCLUDED AS ASSETS IN THE FINANCIAL STATEMENTS. EXHIBITS CONSTRUCTED ARE RECORDED AT THE COST OF CONSTRUCTION.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART XI, LINE 2D - OTHER ADJUSTMENTS:</FormAndLineReferenceDesc>
        <ExplanationTxt>COST OF DIRECT DONOR BENEFITS 50,981. COST OF GOODS SOLD 37,692. EXPENSES OFFSETTING FUNDRAISING REVENUES 65,722. EXPENSES OFFSETTING GROSS RENTS 21,354.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART XII, LINE 2D - OTHER ADJUSTMENTS:</FormAndLineReferenceDesc>
        <ExplanationTxt>COST OF DIRECT DONOR BENEFITS 50,981. COST OF GOODS SOLD 37,692. EXPENSES OFFSETTING FUNDRAISING REVENUE 65,722. EXPENSES OFFSETTING GROSS RENTS 21,354.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleD>
    <IRS990ScheduleG documentId="RetDoc1041300001">
      <FundraisingEventInformationGrp>
        <Event1Nm>FANDANGO</Event1Nm>
        <GrossReceiptsEvent1Amt>174230</GrossReceiptsEvent1Amt>
        <CharitableContriEvent1Amt>103625</CharitableContriEvent1Amt>
        <GrossRevenueEvent1Amt>70605</GrossRevenueEvent1Amt>
        <NonCashPrizesEvent1Amt>11593</NonCashPrizesEvent1Amt>
        <FoodAndBeverageEvent1Amt>26409</FoodAndBeverageEvent1Amt>
        <OtherDirectExpensesEvent1Amt>27752</OtherDirectExpensesEvent1Amt>
        <Event2Nm>GALA</Event2Nm>
        <GrossReceiptsEvent2Amt>23421</GrossReceiptsEvent2Amt>
        <GrossRevenueEvent2Amt>23421</GrossRevenueEvent2Amt>
        <FoodAndBeverageEvent2Amt>25794</FoodAndBeverageEvent2Amt>
        <EntertainmentEvent2Amt>925</EntertainmentEvent2Amt>
        <OtherDirectExpensesEvent2Amt>24230</OtherDirectExpensesEvent2Amt>
        <GrossReceiptsTotalAmt>197651</GrossReceiptsTotalAmt>
        <CharitableContributionsTotAmt>103625</CharitableContributionsTotAmt>
        <GrossRevenueTotalEventsAmt>94026</GrossRevenueTotalEventsAmt>
        <NonCashPrizesTotalEventsAmt>11593</NonCashPrizesTotalEventsAmt>
        <FoodAndBeverageTotalEventsAmt>52203</FoodAndBeverageTotalEventsAmt>
        <EntertainmentTotalEventsAmt>925</EntertainmentTotalEventsAmt>
        <OthDirectExpnssTotalEventsAmt>51982</OthDirectExpnssTotalEventsAmt>
        <DirectExpenseSummaryEventsAmt>116703</DirectExpenseSummaryEventsAmt>
        <NetIncomeSummaryAmt>-22677</NetIncomeSummaryAmt>
      </FundraisingEventInformationGrp>
    </IRS990ScheduleG>
    <IRS990ScheduleM documentId="RetDoc1042900001">
      <SecuritiesPubliclyTradedGrp>
        <NonCashCheckboxInd>X</NonCashCheckboxInd>
        <ContributionCnt>1</ContributionCnt>
        <NoncashContributionsRptF990Amt>1495</NoncashContributionsRptF990Amt>
        <MethodOfDeterminingRevenuesTxt>FMV</MethodOfDeterminingRevenuesTxt>
      </SecuritiesPubliclyTradedGrp>
      <HistoricalArtifactsGrp>
        <NonCashCheckboxInd>X</NonCashCheckboxInd>
        <ContributionCnt>41</ContributionCnt>
        <NoncashContributionsRptF990Amt>0</NoncashContributionsRptF990Amt>
      </HistoricalArtifactsGrp>
      <OtherNonCashContriTableGrp>
        <NonCashCheckboxInd>X</NonCashCheckboxInd>
        <Desc>MISCELLANEOUS</Desc>
        <ContributionCnt>1</ContributionCnt>
        <NoncashContributionsRptF990Amt>1564</NoncashContributionsRptF990Amt>
        <MethodOfDeterminingRevenuesTxt>FMV</MethodOfDeterminingRevenuesTxt>
      </OtherNonCashContriTableGrp>
      <AnyPropertyThatMustBeHeldInd>0</AnyPropertyThatMustBeHeldInd>
      <ReviewProcessUnusualNCGiftsInd>0</ReviewProcessUnusualNCGiftsInd>
      <ThirdPartiesUsedInd>0</ThirdPartiesUsedInd>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART I, LINE 33:</FormAndLineReferenceDesc>
        <ExplanationTxt>A ZERO AMOUNT WAS REPORTED ON SCHEDULE M, PART I, LINE 22 BECAUSE MOSTH DID NOT CAPITALIZE ITS COLLECTIONS, AS ALLOWED UNDER SFAS 116 (ASC 958).</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleM>
    <IRS990ScheduleO documentId="RetDoc1044400001">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 11B</FormAndLineReferenceDesc>
        <ExplanationTxt>FORM 990 IS DISTRIBUTED TO THE BOARD OF TRUSTEES FOR THEIR INPUT BEFORE IT IS FILED.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 12C</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ORGANIZATION HAS APPROVED AND IMPLEMENTED A CONFLICT OF INTEREST POLICY AS OF MARCH 31, 2011. AS PART OF OUR CODE OF ETHICS, WE REQUIRE ALL ASSOCIATES TO DECLARE ANY REAL OR PERCEIVED CONFLICTS OF INTEREST. FURTHERMORE, WE REQUIRE ALL ASSOCIATES TO SIGN THE CODE OF ETHICS ANNUALLY AS PART OF THEIR DEDICATION.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION C, LINE 19</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ORGANIZATION'S GOVERNING DOCUMENTS, INCLUDING THE CONFLICT OF INTEREST POLICY, ARE NOT PLACED IN GENERAL DISTRIBUTION. THE ORGANIZATION'S 990 TAX RETURNS ARE MADE AVAILABLE TO THE PUBLIC UPON REQUEST AND VIA OTHER WEBSITES SUCH AS GUIDESTAR. THE ORGANIZATION'S AUDITED FINANCIAL STATEMENTS AND CODE OF ETHICS ARE ALSO AVAILABLE ON MOSTH'S WEBSITE.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
  </ReturnData>
</Return>