- Oregon State University. Agricultural Experiment Station278
- Oregon State College. Agricultural Experiment Station83
- Oregon Agricultural College. Experiment Station75
- Oregon State College. Extension Service58
- Columbia Basin Agricultural Research Center30
- United States. Agricultural Research Service30
- Oregon State College. Federal Cooperative Extension Service18
- Central Oregon Agricultural Research Center14
- Powers, W. L. (Wilbur Louis), 188714
- Mason, Robert George12
- Cain, R. F. (Robert Farmer), 1917 200811
- Oregon State University. Malheur Experiment Station11
- Mack, H. J.10
- Oregon State Agricultural College. Agricultural Experiment Station9
- Klamath County (Or.)8
- Lewis, C. I. (Claude Isaac), 1880 19248
- Baggett, James R.7
- Brown, William G. (William Galen)7
- Conklin, Frank S.7
- Fore, R. E. (Robert Estes), 1907 7