- Oregon Agricultural College. Experiment Station59
- Oregon Agricultural College. Extension Service32
- Oregon State Agricultural College. Agricultural Experiment Station28
- Forest Products Laboratory (U.S.)21
- Oregon State College. Extension Service20
- Hyslop, G. R. (George Robert), 1884 9
- Robinson, R. H. (Reginald Heber), 1886 8
- Hartman, Henry, 1889 7
- United States. Forest Service7
- Oregon State Agricultural College. Extension Service6
- Potter, E. L. (Ermine Lawrence), 1884 6
- Barss, H. P. (Howard Phillips), 1885 5
- Browne, F. L. (Frederick Lincoln), 1895 5
- Powers, W. L. (Wilbur Louis), 18875
- Schuster, C. E. (Carl Ephraim), 1889 5
- Bouquet, A. G. B. (Arthur George Bristow), 1885 4
- Kable, George W. (George Wallace), 1888 4
- Schoth, H. A. (Harry August), 1891 4
- Zeller, S. M. (Sanford Myron), 1885 19484
- Brown, Gordon G. (Gordon George), 1887 3