- Oregon Agricultural Experiment Station28
- Oregon Agricultural College. Experiment Station23
- Hopkins, A. D. (Andrew Delmar), 1857 194811
- Lewis, C. I. (Claude Isaac), 1880 19248
- Pernot, E. F. (Emile Francis), 18598
- United States. Division Of Forestry7
- Withycombe, James, 1854 6
- Cordley, A. B. (Arthur Burton), 1864 19365
- Dryden, James, 1863 5
- Knisely, A. L. (Abraham Lincoln), 1865 5
- United States. Bureau Of Entomology5
- United States. Forest Service5
- Kent, F. L. (Fred Leroy), 1868 4
- United States. Division Of Entomology4
- Indian War Veterans And Historical Society3
- Native Sons Of Oregon3
- Oregon Pioneer Association3
- Oregon State Agricultural College3
- Oregon State Agricultural College. Experiment Station3
- Wilson, H. F. (Harley Frost), 1883 3