- Oregon State University. Extension Service228
- Oregon State College. Agricultural Experiment Station132
- Pscheidt, Jay W.94
- Fisher, Glenn C.40
- Oregon State University. Agricultural Experiment Station37
- Peachey, Ronald Edward37
- Mote, Don C. (Don Carlos), 1887 36
- Peachey, Ed34
- Walton, Vaughn M.34
- Olsen, Jeff L.29
- Oregon Agricultural College. Experiment Station29
- United States. Forest Service. Northern Region. State & Private Forestry27
- Macswan, Iain C.26
- Wiman, Nik G.25
- Brunner, Jay F.24
- van Steenwyk, Robert A.24
- Burts, Everett23
- Westigard, Peter H.23
- Beers, Elizabeth H.21
- Castagnoli, S.21