Author/Creator
- U.S. Fish and Wildlife Service441
- United States. National Park Service399
- United States. Congress. Senate. Committee on Governmental Affairs391
- International Business Machines Corporation. International Technical Support Organization388
- United States. Government Accountability Office, author373
- American Management Association352
- Pacific Northwest Research Station (Portland, Or.)351
- United States. Congress. Senate. Committee on Energy and Natural Resources292
- United States. War Dept290
- United States. Congress. House. Committee on Naval Affairs283
- United States. Environmental Protection Agency282
- Library of Congress. Congressional Research Service278
- Food and Agriculture Organization of the United Nations272
- United States. Forest Service. Pacific Northwest Region267
- United States. Federal Emergency Management Agency265
- United States. Department of the Army264
- United States. Environmental Protection Agency. Office of Water260
- Oxford University Press254
- United States. Congress. Senate. Committee on Homeland Security and Governmental Affairs254
- United States. Congress. Senate. Committee on Environment and Public Works240