Filtering by
- All Subjects: Hayden, Carl Trumbull, 1877-1972
- All Subjects: Mining
- All Subjects: Page, John H., 1877-1960
- Creators: Potter, A. F.
- Creators: Graves, Henry S.
- Creators: Hoover, Herbert, 1874-1964
- Creators: Smith, George Otih
- Creators: Zachau, Bernie
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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 A. F. Potter to Carl T. Hayden describing John H. Page's request to build a railway for the Canyon Copper Company as "impractical."
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Letter from A. F. Potter to John H. Page referring his request to build a railway to the District Forester at Albuquerque, New Mexico.
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Letter from Henry Graves to Carl T. Hayden regarding the land ownership and grazing rights of the Havasupai.
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Letter from Bernie Zachau to Carl Hayden regarding water power in the Grand Canyon.
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Letter from A. F. Potter to Carl Hayden regarding W. W. Bass's livery permit. Bass's fee to maintain the roads has been reduced to $50 per year, but he will still need to keep his business at least a hundred feet from the Grand Canyon rim so as not to disturb visitors.