Filtering by
- All Subjects: Grand Canyon National Park (Ariz.)
- All Subjects: Bright Angel Trail (Ariz.)
- All Subjects: Advertisements
- All Subjects: Edwards, John Homer, 1869-1945
- Creators: United States Department of the Interior
- Creators: Riordan, M. J.
- Creators: Borkan, Ronald E.
- Creators: Edwards, John H.
Letter from M. J. Riordan to Carl Hayden expressing his opposition to the federal government's takeover of Bright Angel Trail.
Letter from Michael J. Reardon to Carl T. Hayden, in agreement with Ralph Cameron, asserting that Bright Angel Trail should not be sold from Coconino County to the United States.
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.
Typescript report, black and white, describing the mammals of Grand Canyon National Park with cover drawing of a bighorn sheep.
Cooperative National Park Resources Studies Unit for University of Arizona, effects on Glen Canyon Dam releases on Grand Canyon River trips, a technical report, vol. no. 16.