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- United States. National Park Service42
- Mills, Enos A., 1870-192213
- Chicago, Burlington & Quincy Railroad Company7
- Geological Survey (U.S.)7
- Union Pacific Railroad Company7
- Pickering, James H.6
- United States. National Park Service. Rocky Mountain Regional Office6
- United States. Congress. House. Committee on Public Lands5
- United States. Congress. Senate. Committee on Public Lands and Surveys5
- United States. Department of the Interior5
- Burlington Escorted Tours4
- United States4
- United States. Congress. Senate. Committee on Energy and Natural Resources. Subcommittee on Public Lands, National Parks, and Forests4
- Barr, Nevada3
- Dannen, Kent, 1946-3
- Estes Park Chamber of Commerce3
- Musselman, Lloyd K.3
- Natural Resource Program Center (U.S.), issuing body3
- Project Muse3
- Rossiter, Richard, 1945-3