- Oregon State University. Extension Service624
- Oregon State University. Agricultural Experiment Station271
- Oregon State University. Forest Research Laboratory79
- United States. Department Of Agriculture60
- University Of Idaho. Cooperative Extension Service52
- Washington State University. Cooperative Extension51
- United States. Forest Service. Northern Region48
- United States. Forest Service. Northern Region. State & Private Forestry41
- James, Robert L.40
- Pacific Northwest Cooperative Extension37
- Gardner, Ernest Hugh36
- Hannaway, D. B.36
- Mcguire, William S.36
- Gardner, E. Hugh35
- United States. Forest Service30
- Oregon. Department Of Fish And Wildlife29
- Bedell, Thomas E.27
- Jackson, T. L. (Thomas Lloyd), 1922 27
- Youngberg, Harold Wayne, 1929 27
- Bailey, Cindee M.26