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- All Subjects: Eakin, John Ross, 1879-1946
- All Subjects: Demaray, Arthur Edward, 1887-1958
- All Subjects: Insurance claims
- All Subjects: Water-power
- Member of: 100 Years of Grand: The Grand Canyon Centennial Project
Letter from Joseph J. Cotter to Carl Hayden regarding the use of water power and summer homes in the proposed park boundaries.
Letter from Bernie Zachau to Carl Hayden regarding water power in the Grand Canyon.
Letter to Carl T. Hayden regarding a water-power bill in effect for the Grand Canyon.
Travel statistics for Grand Canyon National Park.
Press release comparing visitor attendance to the park by year. A 26 percent increase from 1923 to 1924 is noted.
Letter from Carl Hayden to A. E. Demaray enclosing Ed Hamilton's complaint regarding the road between Grand Canyon Village and Rowe's Well.
Letter from A. E. Demaray to Carl Hayden with Superintendent Tillotson's report on the road between Grand Canyon Village and Rowe's Well.
Letter from J. E. Gavin on behalf of Carl Hayden writing in regards to the insurance claims filed with the National Park.