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- Member of: 100 Years of Grand: The Grand Canyon Centennial Project
Letter from M. J. Riordan to Carl Hayden expressing his opposition to the federal government's takeover of Bright Angel Trail.
Letter from Carl Hayden to Stephen Mather regarding Coconino County's willingness to dispose of Bright Angel Trail as long as the funds acquired would go to building a road between Old Trails Highway at Maine to the Grand Canyon.
Letter from E. C. Finney to Carl Hayden regarding the cost of the Bright Angel Trail and an improved road between the town of Maine and the Grand Canyon.
Black and white print of automobile parked at an overlook. Automobile displays the sign, "Press Car Arizona Republican."
Handwritten cover titled, "Nature Notes of Grand Canyon, Polyphemus Moth, Female, Found at Grand Canyon, 5 July 1928, Vol. 3 - No. 2." Cover includes a drawing of the moth.
Typescript report, black and white, describing the birds of Grand Canyon National Park with cover drawing of a bald eagle.
Black and white print of five women and one man riding mules on the Bright Angel Trail. A wooden sign next to the trail says, "Photo by Kolb Bros." Handwritten annotation, "Annie Goodenough on Bright Angel Trail."