- Oregon Agricultural Experiment Station30
- Oregon Agricultural College. Experiment Station22
- Hopkins, A. D. (Andrew Delmar), 1857 194818
- Pernot, E. F. (Emile Francis), 185910
- United States. Bureau Of Entomology8
- United States. Division Of Forestry8
- Lewis, C. I. (Claude Isaac), 1880 19247
- Withycombe, James, 1854 7
- Cordley, A. B. (Arthur Burton), 1864 19365
- Dryden, James, 1863 5
- Knisely, A. L. (Abraham Lincoln), 1865 5
- United States. Division Of Entomology5
- United States. Forest Service5
- Kent, F. L. (Fred Leroy), 1868 4
- Oregon State Agricultural College4
- Oregon State Agricultural College. Experiment Station4
- United States. Department Of Agriculture4
- Baker, Walter Rawalt3
- Graf, Samuel Herman, 1887 3
- Indian War Veterans And Historical Society3