- Oregon Agricultural College. Experiment Station112
- Oregon Agricultural College. Extension Service47
- Oregon State Agricultural College. Agricultural Experiment Station41
- Forest Products Laboratory (U.S.)23
- Oregon State College. Extension Service23
- Hartman, Henry, 1889 16
- Potter, E. L. (Ermine Lawrence), 1884 16
- Hyslop, G. R. (George Robert), 1884 14
- Powers, W. L. (Wilbur Louis), 188714
- Oregon State Agricultural College. Extension Service12
- Oregon State College. Agricultural Experiment Station12
- Robinson, R. H. (Reginald Heber), 1886 11
- Lovett, A. L. (Arthur Lester), 1885 192410
- Withycombe, Robert, 1880 8
- Barss, H. P. (Howard Phillips), 1885 7
- Bullis, D. E. (Deloss Everett), 1894 19847
- Schuster, C. E. (Carl Ephraim), 1889 7
- United States. Forest Service7
- Childs, Leroy, 1888 6
- Mote, Don C. (Don Carlos), 1887 6