- United States. Forest Service. Northern Region. State & Private Forestry92
- United States. Forest Service. Northern Region36
- Mcgregor, Mark D.25
- James, Robert L.22
- Gibson, Kenneth E.21
- Dooling, Oscar J.19
- Oakes, Robert D.17
- Tunnock, Scott15
- Bousfield, Wayne E.14
- Oregon State University. Extension Service13
- Hamel, Dennis R.12
- Bennett, D. D.10
- Hopkins, A. D. (Andrew Delmar), 1857 19489
- Meyer, Hubert E.8
- Dewey, Jerald E.7
- Byler, James W.6
- Filip, Gregory M.6
- Flavell, Thomas H.6
- Oregon State College. Agricultural Experiment Station6
- Eder, Robert G.5