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- All Subjects: Havasupai Tribe of the Havasupai Reservation, Arizona
- All Subjects: Grand Canyon Village Historic District (Grand Canyon, Ariz. : City)
- All Subjects: Hopi Tribe of Arizona
- All Subjects: Automobiles
- All Subjects: Tillotson, Miner Raymond, 1886-1955
- All Subjects: National parks and reserves
- Member of: 100 Years of Grand: The Grand Canyon Centennial Project
Letter from Fred Harvey to Senator Carl Hayden on the diary of Padre Francisco Garcés and his entry on July 4, 1776.
Letter from Fred Harvey to Senator Carl Hayden on the diary of Padre Francisco Garcés and the lack of knowledge of U.S. citizens regarding the Hopi people.
Letter from Alexander Vogelsang to Homer P. Snyder regarding land allocation for the Havasupai Tribe.
Letter from C. H. Gensler, Havasupai Agency to Carl Hayden regarding boundary lines.
Letter from Carl T. Hayden to C. H. Gensler, Havasupai Indian Reservation, regarding Hualapai and Cataract Canyons geography.
Letter from Henry Graves to Carl T. Hayden regarding the land ownership and grazing rights of the Havasupai.
Letter from Harold Greene to Carl Hayden regarding the proposed boundaries for the national park bill.
Letter from Carl Hayden to H. F. Robinson with attached notes from W. W. Bass and C. H. Gensler. Hayden solitices advice concerning the Havasupai Tribe needs for grazing and access to natural resources.