- Oregon State University. Extension Service240
- Oregon State University. Agricultural Experiment Station231
- Oregon State College. Agricultural Experiment Station68
- Jackson, T. L. (Thomas Lloyd), 1922 61
- Gardner, E. Hugh57
- Jackson, T. L.57
- Oregon State College. Federal Cooperative Extension Service56
- Oregon Agricultural College. Experiment Station54
- Oregon State University. Forest Research Laboratory54
- Pscheidt, Jay W.51
- Oregon State Agricultural College. Agricultural Experiment Station41
- Southern Oregon Agricultural Experiment Station40
- Oregon. State Game Commission34
- Westigard, Peter H.34
- Gardner, Ernest Hugh32
- Oregon State College. Extension Service32
- Pacific Northwest Forest And Range Experiment Station (Portland, Or.)28
- Olsen, Jeff L.23
- Breithaupt, L. R. (Le Roy), 1886 22
- Peachey, Ed22