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Letter from George Otis Smith, U.S. Geological Survey to Carl Hayden regarding asbestos mining prospects in the Grand Canyon.
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Letter from Carl Hayden to George Otis Smith asking his advice regarding the mining of asbestos deposits in the Grand Canyon.
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Letter from George Otis Smith to Carl Hayden regarding mining rights in the Grand Canyon.
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Letter from L. B. Williams to Carl Hayden regarding W. W. Bass' resistance to the park bill.
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Letter from Carl Hayden to L. B. Williams concerning the proposed township in the Grand Canyon.
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Letter from Harry Welch to Carl Hayden enclosing W. W. Bass' letter of protest against the proposed national park bill.
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Letter from W. W. Bass to Harry Welch protesting the proposed national park bill.
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Letter from Carl Hayden to George W. P. Hunt outlining the proposed national park boundaries and the cost of a township if the state of Arizona decided to acquire one on the rim of the Grand Canyon.
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Letter from Stephen T. Mather to Carl Hayden with markup of bill S 390 for the proposed National Park.
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Letter from A. F. Potter to Carl T. Hayden describing John H. Page's request to build a railway for the Canyon Copper Company as "impractical."