- Oregon Agricultural College5
- United States. Forest Service4
- Hazelton, George Cochrane, 1868 19213
- Muir, John, 1838 19143
- Oregon Agricultural College. Alumni Association3
- Oregon Agricultural College. Experiment Station2
- Sudworth, George Bishop, 1862 19272
- Tratman, E. E. R. (Edward Ernest Russell), 1863 2
- United States. Bureau Of Land Management2
- United States. Department Of Agriculture. Forestry Division2
- United States. Division Of Forestry2
- Aanensen, David M.1
- Abatzoglou, John T.1
- Abbe, Cleveland, 1838 19161
- Abbott, John S. C. (John Stevens Cabot), 1805 18771
- Adams, David T.1
- Adamus, Paul R.1
- Additon, Lucia H. Faxon1
- Ahern, George Patrick, 1859 19421
- Alderman, Stephen1