- Oregon State College. Agricultural Experiment Station173
- Pacific Northwest Forest Experiment Station (Portland, Or.)26
- Mote, Don C. (Don Carlos), 1887 18
- Mcwhorter, Frank, 1896 198515
- Bouquet, A. G. B. (Arthur George Bristow), 1885 12
- Breithaupt, L. R. (Le Roy), 1886 11
- Pacific Northwest Forest And Range Experiment Station (Portland, Or.)10
- Buell, Edward D.9
- Burrier, A. S. (Arnold Stewart), 1902 19389
- Owens, Charles Elmer, 1877 9
- Oregon State Agricultural College. Agricultural Experiment Station8
- Zeller, S. M. (Sanford Myron), 1885 19488
- Edwards, W. D. (William Donald), 1904 7
- Oregon State College. Federal Cooperative Extension Service7
- Selby, H. E. (Halbert Edgerton), 1896 7
- Duruz, W. P. (Willis Pierre), 1896 6
- Hoffman, C. S. (Charles Sumner)6
- Jones, I. R. (Idwal Ralph), 1898 6
- Powers, W. L. (Wilbur Louis), 18876
- Knowlton, Frank L. (Frank Lester), 1894 19405