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- All Subjects: Grand Canyon National Park (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.
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Letter from M. J. Riordan to Carl Hayden expressing his opposition to the federal government's takeover of Bright Angel Trail.
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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.
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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.
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Typescript report, black and white, describing the birds of Grand Canyon National Park with cover drawing of a bald eagle.
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Typescript report, black and white, describing the mammals of Grand Canyon National Park with cover drawing of a bighorn sheep.
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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.