- Oregon State University. Extension Service99
- Hart, John M. (John Mervyn), 1947 29
- Oregon State University. Agricultural Experiment Station19
- Christensen, Neil Walter, 1944 9
- Mellbye, Mark Edward7
- Pacific Northwest Cooperative Extension7
- Anderson, Nicole P.6
- Horneck, Donald Arthur6
- Hart, John5
- Strik, Bernadine C. (Bernadine Cornelia), 1962 5
- Youngberg, Harold Wayne, 1929 5
- Cheeke, Peter R.4
- Cropper, James B.4
- Flowers, Michael Darrell, 1971 4
- Gardner, Ernest Hugh4
- Halse, Richard R.4
- Hannaway, D. B.4
- Stebbins, Robert L.4
- Sullivan, Dan M. (Dan Matthew), 1954 4
- Washington State University. Cooperative Extension4