- Oregon State College. Agricultural Experiment Station9
- Jones, I. R. (Idwal Ralph), 1898 5
- Oregon State University. Extension Service5
- Gamroth, Michael J.4
- Brandt, P. M. (Philip Martin), 1888 2
- Washington State University. Cooperative Extension2
- Adams, H. P. (Holyoke Purinton), 1922 1
- Bethard, Greg1
- Buyserie, Annette C.1
- Cannon, Lynn E.1
- Downing, Troy (Troy Woerner)1
- England, David C.1
- Ewalt, H. P.1
- French, Patrick D., 1969 1
- Frischknecht, W. Dean1
- Hoffman, E. N.1
- Jones, I. R. (Idwal Ralph)1
- Oldfield, J. E., 1921 1
- Oregon State Agricultural College. Extension Service1
- Oregon State University. Agricultural Experiment Station1