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- Member of: 100 Years of Grand: The Grand Canyon Centennial Project
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 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 on the increase in wildlife in the Grand Canyon including mountain sheep, deer, and the Abert Squirrel.
Press release comparing visitor attendance to the park by year. A 26 percent increase from 1923 to 1924 is noted.
Letter from Walter Mitchell to Carl Hayden on building a Union Chapel in the Grand Canyon.
Letter from Carl Hayden to Walter Mitchell on building a Union Chapel in the Grand Canyon.