- Oregon State University. Extension Service22
- Oregon State University. Agricultural Experiment Station21
- Oregon State College. Agricultural Experiment Station20
- Jones, I. R. (Idwal Ralph), 1898 13
- Adams, H. P. (Holyoke Purinton), 1922 7
- Gamroth, Michael J.7
- Ewalt, H. P.6
- Hoffman, E. N.6
- Oregon Agricultural College. Experiment Station5
- Potter, E. L. (Ermine Lawrence), 1884 5
- Withycombe, Robert, 1880 5
- Bogart, Ralph, 1908 4
- Brandt, P. M. (Philip Martin), 1888 4
- Frischknecht, W. Dean4
- Oregon Agricultural Experiment Station4
- Raleigh, Robert J.4
- Ralston, A. T. (Allen Thurman), 1915 4
- Anderson, D. E. (Donald Eugene)3
- Oldfield, J. E., 1921 3
- Sneva, Forrest3