- Oregon Agricultural College. Extension Service8
- Hopkins, A. D. (Andrew Delmar), 1857 19486
- Oregon Agricultural College6
- Oregon State College. Extension Service6
- Oregon Agricultural College. Experiment Station5
- United States. Department Of Agriculture. Forestry Division5
- United States. Division Of Forestry5
- Fernow, B. E. (Bernhard Eduard), 1851 19234
- United States. Department Of Agriculture4
- Hazelton, George Cochrane, 1868 19213
- Indian War Veterans And Historical Society3
- Native Sons Of Oregon3
- Oregon Agricultural College. Alumni Association3
- Oregon Pioneer Association3
- Oregon State Agricultural College3
- Oregon State Agricultural College. Agricultural Experiment Station3
- Tratman, E. E. R. (Edward Ernest Russell), 1863 3
- United States. Division Of Entomology3
- United States. Forest Service3
- Abbott, John S. C. (John Stevens Cabot), 1805 18772