- Oregon Agricultural College. Experiment Station111
- Forest Products Laboratory (U.S.)49
- Oregon Agricultural College. Extension Service43
- Oregon State Agricultural College. Agricultural Experiment Station43
- Oregon State College. Extension Service21
- Potter, E. L. (Ermine Lawrence), 1884 18
- Powers, W. L. (Wilbur Louis), 188714
- Hartman, Henry, 1889 13
- Robinson, R. H. (Reginald Heber), 1886 11
- Oregon State Agricultural College. Extension Service10
- Withycombe, Robert, 1880 9
- Lovett, A. L. (Arthur Lester), 1885 19248
- United States. Forest Service8
- Bullis, D. E. (Deloss Everett), 1894 19847
- Hyslop, G. R. (George Robert), 1884 7
- Schuster, C. E. (Carl Ephraim), 1889 7
- Barss, H. P. (Howard Phillips), 1885 6
- Childs, Leroy, 1888 6
- Ritter, George J.6
- Wiegand, Ernest Herman, 1886 6