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- All Subjects: Grand Canyon National Park (Ariz.)
- Creators: United States Department of the Interior
- Creators: Cameron, Ralph H.
- Creators: McCutcheon, John T.
- Creators: Russell, H. L.
Letter from Ralph H. Cameron to Carl Hayden thanking him for forwarding Senate Bill No. 390 with the report of March 31st, 1918, and expressing interest in their upcoming meeting in Washington.
Letter from Ralph H. Cameron to Carl Hayden requesting a delay on the introduction of the Grand Canyon bill until he can meet with himself and Senator Ashurst in Washington.
Letter from Ralph H. Cameron asking to speak to Carl Hayden concerning a matter relevant to the bill granting National Park status to the Grand Canyon.
Letter from H. L. Russell to Carl Hayden regarding fines in the park.
Description of traveling down Bright Angel Trail by donkey.
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.