- Oregon State University. Extension Service29
- Oregon State University. Agricultural Experiment Station16
- Oregon State College. Agricultural Experiment Station14
- Oregon Agricultural College. Experiment Station11
- Powers, W. L. (Wilbur Louis), 18879
- Hansen, Hugh J.8
- Oregon State Agricultural College. Agricultural Experiment Station8
- Trimmer, Walter L.8
- Washington State University. Cooperative Extension6
- Pacific Northwest Cooperative Extension5
- United States. Department Of Agriculture5
- University Of Idaho. Cooperative Extension Service5
- Columbia Basin Agricultural Research Center4
- Flock, Rebecca4
- Pereira, Andre4
- Shearer, Marvin N.4
- Shock, Cedric A.4
- Shock, Clinton C.4
- Baggett, James R.3
- Becker, Manning H. (Manning Henry), 1922 3