100 Years of Grand: The Grand Canyon Centennial Project
A digital archive celebrating the Centennial of the Grand Canyon National Park. A collaborative project of the Arizona State University Library, Cline Library, Northern Arizona University, and the Grand Canyon National Park. Additional materials are available via the project website.
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Detailed map of Granite Gorge section of the Grand Canyon from the pamphlet titled, "Titan of Chasms: Grand Canyon of Arizona."
Letter from Joseph J. Cotter to Carl Hayden regarding the use of water power and summer homes in the proposed park boundaries.
Letter from Carl T. Hayden to C. H. Gensler, Havasupai Indian Reservation, regarding Hualapai and Cataract Canyons geography.
Letter from The Camp Fire Club of America urging Carl Hayden to introduce a bill that would grant National Park status to the Grand Canyon.