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- All Subjects: South Kaibab Trail (Ariz.)
- All Subjects: Automobiles
- All Subjects: Water-power
- Member of: 100 Years of Grand: The Grand Canyon Centennial Project
- Status: Published
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."
Letter to Carl T. Hayden regarding a water-power bill in effect for the Grand Canyon.
Letter from Bernie Zachau to Carl Hayden regarding water power in the Grand Canyon.
Letter from Joseph J. Cotter to Carl Hayden regarding the use of water power and summer homes in the proposed park boundaries.
Black and white print of people riding mules down a trail. Circa 1940-1949.
Black and white print of automobile parked at an overlook. Automobile displays the sign, "Press Car Arizona Republican."
Letter from Stephen T. Mather to Carl T. Hayden advocating for a reduction in automobile fees for the South Rim entrance.