- Oregon State University. Extension Service420
- United States. Bureau Of Land Management320
- Klamath Falls Resource Area315
- Washington State University. Extension60
- Oregon State University. Agricultural Experiment Station58
- Pacific Northwest Cooperative Extension58
- University Of Idaho. Extension57
- Institute For Natural Resources45
- Hart, John M. (John Mervyn), 1947 26
- Wheeler, Patricia A.26
- Fleischbein, Jane25
- Huyer, Adriana, 1945 25
- Smith, Robert L. (Robert Lloyd), 1935 25
- United States. Forest Health Protection25
- Kosro, P. Michael, 1951 24
- United States. Forest Service. Northern Region24
- Oregon State University. Forest Research Laboratory23
- Myers, James R.21
- Barth, Jack A.18
- Horneck, Donald Arthur18