Filtering by
- All Subjects: Mining
- All Subjects: Cataract Canyon (Wayne County-San Juan County, Utah)
- All Subjects: World War, 1914-1918
- Creators: Hayden, Carl T.
- Creators: Burke, Charles H.
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Letter from Carl T. Hayden to C. H. Gensler, Havasupai Indian Reservation, regarding Hualapai and Cataract Canyons geography.
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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 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 Hugh E. Campbell with an enclosed outline map of the proposed boundaries of Grand Canyon National Park.
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Letter from Charles H. Burke to Carl T. Hayden about mining on Diné (formerly Navajo) national land.
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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.