Filtering by
- All Subjects: Mining
- All Subjects: Breen, Fred Sylvester, 1869-1932
- All Subjects: McKee, Edwin Dinwiddie, 1906-1984
- All Subjects: Automobiles
- Creators: Hayden, Carl T.
- Creators: United States Department of the Interior
Letter from Carl Hayden to George Otis Smith asking his advice regarding the mining of asbestos deposits in the Grand Canyon.
Letter from Carl Hayden to Fred S. Breen regarding Yaki Point, the sale of Bright Angel Trail and the building of a road between Maine and the Grand Canyon.
Letter from Carl T. Hayden to Louis C. Cramton about potential prosecution of people with mining claims within park boundaries.
Letter from Carl T. Hayden to Alf Dickenson about mine locations within the park.
Letter from Carl T. Hayden to Fred S. Breen concerning the expenditure of $100,000 to purchase Bright Angel Trail.
Typescript report, black and white, describing the mammals of Grand Canyon National Park with cover drawing of a bighorn sheep.
Typescript report, black and white, describing the birds of Grand Canyon National Park with cover drawing of a bald eagle.