- Oregon State College. Agricultural Experiment Station41
- Mumford, D. Curtis (Dwight Curtis), 1900 19
- Oregon State University. Extension Service18
- Oregon State University. Agricultural Experiment Station12
- Oregon State Agricultural College. Agricultural Experiment Station11
- Upper Willamette Resource Conservation And Development Project8
- Kuhlman, G. W. (Gustav Wesley), 1894 7
- Powers, W. L. (Wilbur Louis), 18877
- Becker, Manning H. (Manning Henry), 1922 6
- Davis, George B. (George Balfour), 1915 6
- Jackson, T. L. (Thomas Lloyd), 1922 5
- Conklin, Frank S.4
- Oregon State College. Federal Cooperative Extension Service4
- Selby, H. E. (Halbert Edgerton), 1896 4
- Blosser, John H.3
- Crane, Jimmie M.3
- Edwards, W. D. (William Donald), 1904 3
- Gray, K. W. (Kenneth Wiesner), 1905 3
- Jolliff, Gary D.3
- Miller, Stanley F.3