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- All Subjects: Mining
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- All Subjects: South Kaibab Trail (Ariz.)
- All Subjects: Hopi Tribe of Arizona
- All Subjects: Albright, Horace Marden, 1890-1987
- Member of: 100 Years of Grand: The Grand Canyon Centennial Project
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Letter from Fred Harvey to Senator Carl Hayden on the diary of Padre Francisco Garcés and his entry on July 4, 1776.
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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.
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Letter from George Otis Smith, U.S. Geological Survey to Carl Hayden regarding asbestos mining prospects in the Grand Canyon.
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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 George Otis Smith to Carl Hayden regarding mining rights in the Grand Canyon.
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Letter from A. F. Potter to Carl T. Hayden describing John H. Page's request to build a railway for the Canyon Copper Company as "impractical."
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Letter from John H. Page regarding his right to build a railway between Grand Canyon Station and the Canyon Copper Company's mines and hotel.