- Oregon State University. Extension Service260
- Oregon State University. Cooperative Extension Service92
- Oregon State University. Agricultural Experiment Station88
- Oregon State University. Extension Service/Marine Advisory Program50
- Upper Willamette Resource Conservation And Development Project37
- United States. Forest Service27
- Pacific Northwest Cooperative Extension23
- University Of Idaho. Cooperative Extension Service16
- Betts, Harold S. (Harold Scofield)14
- Oregon State University Extension Service. Resource Conservation And Development Project Office13
- Smith, Frederick J. (Frederick John), 1936 13
- Washington State University. Cooperative Extension Service13
- Mansour, N. S.11
- Allen, J. S.10
- Oregon State University10
- Oregon State University. Extension Service/Sea Grant Marine Advisory Program10
- Brown, Dorothy F. (Dorothy Furtick)9
- Jackman, E. R.8
- Jackman, E. R. (Edwin Russell), 1894 19678
- Gardner, Ernest Hugh7