- Oregon State University. Agricultural Experiment Station30
- Oregon State College. Agricultural Experiment Station22
- Oregon State College. Extension Service20
- Columbia Basin Agricultural Research Center11
- Oregon State College. Federal Cooperative Extension Service7
- United States. Agricultural Research Service7
- Klamath County (Or.)5
- Wilster, G. H. (Gustav Hans), 18935
- Breithaupt, L. R. (Le Roy), 1886 3
- Deloach, D. B. (Daniel Barton), 1904 3
- Eastern Oregon Agricultural Research Center3
- Linn County (Or.)3
- Oregon State University. Klamath Agricultural Experiment Station3
- Ritcher, Paul O.3
- Bailey, Sam H.2
- Benton County (Or.)2
- Bogart, Ralph, 1908 2
- Dreesen, W. H. (William Henry), 1880 2
- Gabriel, Stephen R.2
- Horrell, Elvera2