- Thompson, B. G. (Benjamin Garrison), 1891 23
- Oregon State College. Agricultural Experiment Station10
- Mote, Don C. (Don Carlos), 1887 8
- Oregon State College. Federal Cooperative Extension Service6
- Oregon State University5
- Miller, P. W. (Paul William), 1901 3
- Oregon State Agricultural College. Extension Service3
- Pacific Northwest Forest And Range Experiment Station (Portland, Or.)3
- Abbott, John S. C. (John Stevens Cabot), 1805 18772
- Brandt, Patricia A.2
- Conwell, Russell Herman, 1843 19252
- Crowell, H. H. (Hamblin Howes), 1913 2
- Eichelberger, Justin E.2
- Oregon Agricultural College. Alumni Association2
- Oregon Agricultural College. Experiment Station2
- United States. Bureau Of Land Management2
- Villard, Henry, 1835 19002
- Williams, Gerald W.2
- Abbe, Cleveland, 1838 19161
- Abdollahi, Abbas1