- Oregon Agricultural College. Extension Service16
- Oregon Agricultural College. Experiment Station15
- Forest Products Laboratory (U.S.)4
- Gardner, Victor Ray, 1885 4
- Lovett, A. L. (Arthur Lester), 1885 19244
- Oregon Agricultural College4
- Oregon Agricultural College. Extension Division4
- Barss, H. P. (Howard Phillips), 1885 3
- Kraus, E. J. (Ezra Jacob), 1885 3
- Lewis, C. I. (Claude Isaac), 1880 19243
- Oregon State Agricultural College. Extension Service3
- Johnson, A. Grace2
- Magness, J. R. (John Robert), 1894 2
- Potter, E. L. (Ermine Lawrence), 1884 2
- Schorger, A. W. (Arlie William), 1884 19722
- Scudder, H. D. (Henry Desborough), 1881 2
- United States. Forest Service2
- Wilson, H. F. (Harley Frost), 1883 2
- Allen, R. W. (Ralph Wilmer), 1885 1
- Bade, William Frederic, 1871 19361