- Oregon State University. Extension Service16
- Hart, John M. (John Mervyn), 1947 11
- Pumphrey, F. V. (Floyd Vance)9
- Lutcher, L. K. (Lawrence K.)8
- Christensen, Neil Walter, 1944 7
- Flowers, Michael Darrell, 1971 7
- Gardner, Ernest Hugh7
- Horneck, Donald Arthur7
- Wysocki, Donald John, 1952 7
- Oregon State University. Agricultural Experiment Station6
- Oregon State College. Agricultural Experiment Station5
- Corp, Mary K.4
- Cushman, Howard E.4
- Jackson, T. L. (Thomas Lloyd), 1922 4
- Mellbye, Mark Edward4
- Moore, David Paul, 1931 4
- Oregon State University. Cooperative Extension Service4
- Petrie, S. E.4
- Rydrych, Donald J.3
- Anderson, Nicole P.2