- Oregon Agricultural College. Experiment Station50
- Oregon State Agricultural College. Agricultural Experiment Station27
- Forest Products Laboratory (U.S.)19
- Oregon State College. Extension Service16
- Powers, W. L. (Wilbur Louis), 188713
- Hartman, Henry, 1889 12
- Oregon Agricultural College. Extension Service12
- United States. Forest Service7
- Barss, H. P. (Howard Phillips), 1885 5
- Childs, Leroy, 1888 5
- Lovett, A. L. (Arthur Lester), 1885 19245
- Potter, E. L. (Ermine Lawrence), 1884 5
- Robinson, R. H. (Reginald Heber), 1886 5
- Browne, F. L. (Frederick Lincoln), 1895 4
- Bullis, D. E. (Deloss Everett), 1894 19844
- Johnston, W. W. (William Waters), 1896 4
- Mote, Don C. (Don Carlos), 1887 4
- Selby, H. E. (Halbert Edgerton), 1896 4
- Show, S. B. (Stuart Bevier), 1886 19634
- Zeller, S. M. (Sanford Myron), 1885 19484