- Oregon State University. Extension Service59
- Oregon State College. Agricultural Experiment Station30
- Hart, John M. (John Mervyn), 1947 25
- United States. Forest Service. Northern Region. State & Private Forestry21
- Bousfield, Wayne E.12
- Mellbye, Mark Edward11
- Christensen, Neil Walter, 1944 10
- Gardner, Ernest Hugh9
- Oregon State University. Forest Research Laboratory9
- Jackson, T. L. (Thomas Lloyd), 1922 8
- Anderson, Nicole P.7
- Horneck, Donald Arthur7
- Oregon State University. Agricultural Experiment Station7
- Tunnock, Scott7
- Sullivan, Dan M. (Dan Matthew), 1954 6
- Flavell, Thomas H.5
- Flowers, Michael Darrell, 1971 5
- Fore, R. E. (Robert Estes), 1907 5
- Dewey, Jerald E.4
- Gingrich, Gale Allen4