- Oregon State University. Extension Service19
- Bachelet, Dominique11
- Dalton, Meghan11
- Fleishman, Erica11
- Levy, Joseph5
- Oregon State Agricultural College. Agricultural Experiment Station5
- Oregon State College. Extension Service5
- Rupp, David5
- Valde, Gary5
- Dreesen, W. H. (William Henry), 1880 4
- United States. Forest Service4
- Baer, Adela S., 1931 3
- Levy, Joseph S.3
- Oregon State College. Agricultural Experiment Station3
- Oregon State University. Agricultural Experiment Station3
- Oregon State University. Water Resources Research Institute3
- Ruttle, Marilyn3
- Scharback, Ron3
- Sutherland, Charles F.3
- Allen, Andrew E.2