- Oregon State Agricultural College. Extension Service76
- Oregon Agricultural College. Extension Service35
- Oregon Agricultural College. Experiment Station8
- Barss, H. P. (Howard Phillips), 1885 7
- Dryden, James, 1863 7
- Lovett, A. L. (Arthur Lester), 1885 19247
- United States. Forest Service7
- Southern Pacific Company4
- Barss, A. F. (Alden Forrest), 1888 3
- Bouquet, A. G. B. (Arthur George Bristow), 1885 3
- Brown, W. S. (Walter Sheldon), 1878 3
- Cowgill, Helen Julia3
- Ladd & Bush Bankers3
- Mckay, M. B. (Marion Bertice), 1887 3
- Turley, Anna M.3
- Williams, John Harvey, 1864 3
- Beckwith, T. D. (Theodore Day), 1879 19462
- Conover, Charles Tallmadge, 1862 19612
- Fitts, Edward B.2
- Graves, Henry Solon, 1871 19512