- Oregon State Agricultural College. Agricultural Experiment Station13
- Oregon State Agricultural College. Extension Service12
- Forest Products Laboratory (U.S.)11
- Oregon State College. Federal Cooperative Extension Service10
- Oregon State College. Agricultural Experiment Station7
- Cowgill, Helen Julia6
- Oregon State College. Extension Service6
- Automobile Club Of Oregon3
- Bray, Mark W.3
- Browne, F. L. (Frederick Lincoln), 1895 3
- Bullis, D. E. (Deloss Everett), 1894 19843
- Oregon Agricultural College. Extension Service3
- Oregon Federal Writers' Project3
- Oregon Historical Records Survey3
- Schuster, C. E. (Carl Ephraim), 1889 3
- United States. Forest Service3
- Wiegand, Ernest Herman, 1886 3
- Ballard, Frank Llewellyn2
- Besse, Ralph S. (Ralph Stephen), 1887 2
- Bouquet, A. G. B. (Arthur George Bristow), 1885 2