Matching Items (3)
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- All Subjects: Grand Canyon National Park (Ariz.)
- Creators: Underhill, A. Heaton
- Creators: Breen, Fred S.
ContributorsBreen, Fred S. (Contributor)
Created1924-12-07
Description
Letter from Fred Breen to Carl Hayden regarding the sale of Bright Angel Trail.
ContributorsUnderhill, A. Heaton (Author) / Borkan, Ronald E. (Author) / Battelle Memorial Institute. Technology Partnership Practice (Publisher)
Created1986-04
Description
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.
ContributorsGreenberg, Laura B. (Author) / Underhill, A. Heaton (Author) / Cooperative National Park Resources Studies Unit, University of Arizona (Publisher)
Created1986-03
DescriptionCooperative National Park Resources Study Unit of Arizona, a special report, v no. 4, improving viistor communciation in Grand Canyon National Park