Filtering by
- All Subjects: maps
- All Subjects: Mining
- Creators: Hayden, Carl T.
- Creators: Grand Canyon National Park, National Park Service, U.S. Department of the Interior
- Creators: Mathes, François E.
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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 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 François E. Mathes to Carl T. Hayden about maps of the Grand Canyon.
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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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