- Oregon State Agricultural College. Extension Service25
- Oregon Agricultural College. Extension Service22
- Barss, H. P. (Howard Phillips), 1885 5
- Lovett, A. L. (Arthur Lester), 1885 19245
- Oregon Agricultural College. Experiment Station4
- Brown, W. S. (Walter Sheldon), 1878 3
- Dryden, James, 1863 3
- Ladd & Bush Bankers3
- Southern Pacific Company3
- United States. Forest Service3
- Bouquet, A. G. B. (Arthur George Bristow), 1885 2
- Conover, Charles Tallmadge, 1862 19612
- Hyslop, G. R. (George Robert), 1884 2
- Lines, John Donald2
- Mckay, M. B. (Marion Bertice), 1887 2
- Oregon Agricultural College2
- United States Geographic Board2
- University Of Oregon2
- Williams, John Harvey, 1864 2
- Wilson, H. F. (Harley Frost), 1883 2