- Oregon State University. Extension Service41
- Mayer, Daniel F.29
- Lunden, Jeff D.28
- Graham, R. D. (Robert D.)22
- Levine, Murray D.21
- Oregon State College. Federal Cooperative Extension Service21
- Hamel, Dennis R.20
- United States. Forest Service. Northern Region. State & Private Forestry20
- Mcgregor, Mark D.18
- Breithaupt, L. R. (Le Roy), 1886 16
- Gard, Steve R.16
- Bellantoni, L.15
- Mcgivern, C. L.15
- Schellman, H.15
- Thomas, M. D.15
- Oregon State University. Agricultural Experiment Station13
- Boyd, Timothy John, 1958 201312
- Jasso, M. R.12
- Oregon State College. Agricultural Experiment Station12
- Oregon State University. Forest Research Laboratory12