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- All Subjects: Grand Canyon National Park (Ariz.)
- Creators: United States Geological Survey
- Creators: Moran, P. J.
- Creators: R. P. Gilliland, R. P. Gilliland
- Creators: Russell, H. L.
Letter from R.P Gilliland to Carl Hayden regarding the sale of Bright Angel Trail (Ariz.) and construction of the President's Highway from Maine, AZ, to the Grand Canyon.
Geological examination of the park canyonland, with description of the rocks, water sculping process, volcanic cones and outflows, and land erosion. This edition is Volume 2, 1977 reprint, of the author's 1882 monograph. Includes 12 color maps, 10 color views and is number 280/1500.
Letter from H. L. Russell to Carl Hayden regarding fines in the park.
Letter from P. J. Moran to Carl T. Hayden inquiring when construction will begin on the approach road to Bright Angel Trail.
Letter from P. J. Moran to Carl T. Hayden inquiring when construction will begin on the approach road to Bright Angel Trail.