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      </OtherLandBuildingsGrp>
    </IRS990ScheduleD>
    <IRS990ScheduleO documentId="RetDoc4">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990 - ORGANIZATION'S MISSION</FormAndLineReferenceDesc>
        <ExplanationTxt>TO SPONSOR AND ENGAGE IN RESEARCH RELATED TO SOLUTION MINING, CAVERN UTILIZATION, AND ENVIRONMENTAL EFFECTS THEREOF AND TO PRESENT PAPERS OF CURRENT INTEREST TO THE INDUSTRY RELATIVE TO SOLUTION MINING AND CAVERN UTILIZATION.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PAGE 6, PART VI, LINE 6</FormAndLineReferenceDesc>
        <ExplanationTxt>THERE ARE MEMBER ORGANIZATIONS, BUT NO STOCKHOLDERS. THESE ORGANIZATIONS ELECT THE 3 EXECUTIVE COMMITTEE MEMBERS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PAGE 6, PART VI, LINE 7A</FormAndLineReferenceDesc>
        <ExplanationTxt>DURING THE ORGANIZATION'S ANNUAL SPRING MEETING, THE MEMBERSHIP AT LARGE ELECTS MEMBERS OF THE GOVERNING BODY.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PAGE 6, PART VI, LINE 7B</FormAndLineReferenceDesc>
        <ExplanationTxt>DECISIONS ON WHICH RESEARCH PROJECTS TO PURSUE ARE SUBJECT TO APPROVAL BY THE MEMBERSHIP AT LARGE.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PAGE 6, PART VI, LINE 11B</FormAndLineReferenceDesc>
        <ExplanationTxt>FORM 990 IS REVIEWED BY THE EXECUTIVE DIRECTOR</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PAGE 6, PART VI, LINE 19</FormAndLineReferenceDesc>
        <ExplanationTxt>GOVERNING DOCUMENTS ARE AVAILABLE TO THE MEMBERS ONLY ON THE ORGANIZATION'S WEBSITE</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
  </ReturnData>
</Return>