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        <ReturnReference>Part III, Line 1a:</ReturnReference>
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        <Identifier>Description of Uncertain Tax Positions Under FIN 48:</Identifier>
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        <Explanation>The Museum follows the Accounting for Uncertainty in Income Taxes accounting standard which requires the Museum to determine whether a tax position (and the related tax benefit) is more likely than not to be sustained upon examination by the applicable taxing authority, based solely on the technical merits of the position. The Museum believes that it has appropriate support for any tax positions taken, and as such, does not have any uncertain tax positions that are significant to the financial statements. The Museum's federal Return of Organization Exempt From Income Tax (Form 990) for the previous three years are subject to examination by the IRS, generally for three years after they were filed.</Explanation>
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        <PurposeOfGrant>$59,333 for general operating support, $2,670,000 restricted for exhibit/collection funds</PurposeOfGrant>
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        <NumberOfContributions>7</NumberOfContributions>
        <NoncashContribsRptdF990>0</NoncashContribsRptdF990>
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        <NonCashCheckbox>X</NonCashCheckbox>
        <Description>Equip/Software</Description>
        <NumberOfContributions>1</NumberOfContributions>
        <NoncashContribsRptdF990>115302</NoncashContribsRptdF990>
        <MethodOfDeterminingRevenues>Fair market value</MethodOfDeterminingRevenues>
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      <OtherNonCashContributionsTable>
        <NonCashCheckbox>X</NonCashCheckbox>
        <Description>Phones &amp; Ins.</Description>
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        <MethodOfDeterminingRevenues>Fair market value</MethodOfDeterminingRevenues>
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        <NonCashCheckbox>X</NonCashCheckbox>
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        <Identifier>Non Reporting of Revenue:</Identifier>
        <ReturnReference>Part I, Line 33:</ReturnReference>
        <Explanation>The Museum's collections, which were acquired through purchases, contributions, and active field collecting since the Museum's inception, are not recognized as assets on the statement of financial position. Purchases of collection items are recorded as decreases in unrestricted net assets in the year in which the items are acquired. Contributed collection items are not reflected on the financial statements. Proceeds from deaccessions or insurance recoveries are reflected as increases in the appropriate net asset classes. The Museum had several accessions of donated objects in 2010, including the following: - Collection of Mesoamerican obejcts. - Rare Books, The Henry Toll Collection of publications relating to the Grand Canyon. - Navajo Weavings, pueblo ceramics, baskets, doll set and associated documentation. - 1 womans 14k white gold ring with 10x8 mm blue star sapphire.</Explanation>
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      <GeneralExplanation>
        <Identifier>Form 990, Part VI, Section A, line 4</Identifier>
        <Explanation>On April 13, 2010 the Board of Trustees adopted significant changes to the Museum's bylaws. These changes were developed and approved by the Nominating and Governance Committee with support from Museum staff and outside legal counsel. The amendments clarified trustee terms of office, and eliminated grandfathering clauses that would create additional terms of office in certain circumstances. The revisions adopted state statute provisions that allow the board to act without a meeting in accordance with specified notice and voting procedures. The revisions allow the Executive Committee of the board to act on behalf of the board, and to bring forth all actions to the next board meeting for approval. The revisions made all vice presidents of the Museum also officers of the corporation. Under the guidance of legal counsel, the revisions updated corporate indemnifications provided by the Museum.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <Identifier>Form 990, Part VI, Section B, line 11</Identifier>
        <Explanation>The completed Form 990 is reviewed by the Audit and Finance Committee, and subsequently by the Governing Board of the Museum prior to submission to the Internal Revenue Service.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <ReturnReference>Form 990, Part VI, Section B, line 12c</ReturnReference>
        <Explanation>Conflict of interest disclosures are completed yearly by trustees, officers, and directors. Potential conflicts, whether initially disclosed or subsequently discovered, are reviewed by the Nominating and Governance Committee to determine if a conflict actually exists. The Nominating and Governance Committee provides a report of conflicts and Committee decisions to the Board yearly. Trustees, officers, or directors that may have a conflict are prohibited from participating at both the Committee and/or Board level in deliberations regarding any potential or actual conflict. Legal counsel conducts an independent review of the conflict disclosure statements.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <ReturnReference>Form 990, Part VI, Section B, line 15</ReturnReference>
        <Explanation>The Compensation Committee of the Board of Trustees is responsible for evaluating the performance, compensation, and benefits of the President/CEO as well as those in a position to exercise substantial influence over the affairs of the Museum, including the officers and senior administrative staff. The Compensation Committee solicits feedback annually from the Board of Trustees and senior staff regarding the President/CEO's performance. This feedback is reviewed and discussed by the Compensation Committee in conjunction with comparable salary data. After deliberation, the Committee's recommendations are presented to the Board of Trustees Chair who informs the President/CEO of compensation and benefits for the upcoming year. The Chair reports final salary decisions to the entire Board of Trustees at the next available board meeting. The President/CEO conducts, annually, a performance review of each member of the Senior Leadership Team. Using comparable salary data and compensation adjustment guidelines reviewed by the Board of Trustees, the President/CEO determines the compensation and benefits for each member of the Senior Leadership Team. The President/CEO then presents this information to the Compensation Committee for their review and approval. Minutes are kept for each meeting of the Compensation Committee.</Explanation>
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      <GeneralExplanation>
        <ReturnReference>Form 990, Part VI, Section C, line 19</ReturnReference>
        <Explanation>Governing documents are publicly filed with the Secretary of State and are available upon request. The conflict of interest policy is also made available upon request. Financial Statements are published in DMNS's annual report and supplied upon request.</Explanation>
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      <GeneralExplanation>
        <Identifier>Changes in Net Assets or Fund Balances:</Identifier>
        <ReturnReference>Form 990, Part XI, line 5:</ReturnReference>
        <Explanation>Net unrealized gains on investments: 18,382.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <ReturnReference>Form 990, Part XII, line 2c</ReturnReference>
        <Explanation>This process has not changed from the prior year.</Explanation>
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