Filtering by
- All Subjects: maps
- All Subjects: Mining
- All Subjects: Albright, Horace Marden, 1890-1987
- All Subjects: Matthes, François Émile, 1874-1948
- All Subjects: Theodore Roosevelt Dam (Ariz.)
- All Subjects: World War I
- Creators: Hayden, Carl T.
- Creators: The Military engineer
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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 of introduction for Dwight B. Heard on the arrival of National Park Service Director Stephen T. Mather to Phoenix. Mather's visit includes trips to Roosevelt Dam and Tumacácori.
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Letter from Carl Hayden to L. L. Ferrall on the favorable conditions for creating a national park and the prospect of the United States entering WW I.
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Letter from Carl Hayden to W. W. Bass asking his opinion on the proposed boundaries of the National Park. GC Natl Park written on the letter in blue pencil.
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Letter from Carl Hayden to W. W. Bass asking his opinion on the proposed boundaries of the National Park. GC National Park written on the letter in red pencil.
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Letter from Carl Hayden to Hugh E. Campbell with an enclosed outline map of the proposed boundaries of Grand Canyon National Park.
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Letter from Carl Hayden to Horace M. Albright regarding the grazing rights of Bankhead and Henderson.
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Letter from Carl T. Hayden to Alf Dickenson about mine locations within the park.
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Letter from Carl T. Hayden to Louis C. Cramton about potential prosecution of people with mining claims within park boundaries.
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