- Oregon Agricultural Experiment Station43
- Oregon Agricultural College. Experiment Station42
- United States. Forest Service21
- Lewis, C. I. (Claude Isaac), 1880 192411
- Oregon Agricultural College. Extension Service10
- Oregon Agricultural College9
- United States. Division Of Forestry9
- Pernot, E. F. (Emile Francis), 18598
- Shaw, G. W. (George Wright), 1864 8
- Cordley, A. B. (Arthur Burton), 1864 19367
- Oregon State Agricultural College7
- Withycombe, James, 1854 7
- United States. Department Of Agriculture. Forestry Division6
- Kent, F. L. (Fred Leroy), 1868 5
- Knisely, A. L. (Abraham Lincoln), 1865 5
- Oregon State Agricultural College. Experiment Station5
- Powers, W. L. (Wilbur Louis), 18875
- United States. Department Of Agriculture5
- Coote, George, 1842 19084
- Forest Products Laboratory (U.S.)4