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- Farrow, Nick51
- U.S. Fish and Wildlife Service50
- Project Muse42
- United States. Soil Conservation Service41
- United States. National Park Service40
- United States. War Department39
- Bartlett, Gillian37
- Nicholas, Damian37
- United States. Dept. of Defense (1949- )37
- United States. Congress. Senate. Committee on Energy and Natural Resources. Subcommittee on Public Lands, National Parks, and Forests36
- United States. Congress. House. Committee on Merchant Marine and Fisheries. (1935- )30
- United States. Congress. Senate. Committee on Public Lands and Surveys. (1921-1946)29
- United States. Department of State29
- United States. Congress. Senate. Committee on Energy and Natural Resources27
- Holmes, Abbe26
- Jackson, Henry M. (Henry Martin), 1912-198326
- Roberts, Paul25
- United States. Army25
- United States. Congress. House. Committee on Resources25
- Geological Survey (U.S.), issuing body24