- Oregon State Agricultural College. Agricultural Experiment Station33
- Forest Products Laboratory (U.S.)25
- Oregon State College. Agricultural Experiment Station19
- Oregon State College. Extension Service13
- Browne, F. L. (Frederick Lincoln), 1895 8
- Oregon State Agricultural College. Extension Service6
- Besse, Ralph S. (Ralph Stephen), 1887 5
- Bullis, D. E. (Deloss Everett), 1894 19845
- Oregon State College. Engineering Experiment Station5
- Wiegand, Ernest Herman, 1886 5
- Zeller, S. M. (Sanford Myron), 1885 19485
- United States. Forest Service4
- Wilson, Maud4
- Wilster, G. H. (Gustav Hans), 18934
- Gleeson, George Walter, 1905 3
- Markwardt, L. J. (Lorraine Joseph), 1889 3
- Nelson, Milton Nels, 1891 3
- Oregon State College. Federal Cooperative Extension Service3
- Pacific Northwest Forest Experiment Station (Portland, Or.)3
- Sulerud, George L. (George Leslie), 1900 3