- Oregon Agricultural College. Experiment Station8
- United States. Division Of Forestry8
- Pinchot, Gifford, 1865 19462
- Wilson, H. F. (Harley Frost), 1883 2
- Bruce, Eugene S. (Eugene Sewell), 1869 19201
- Burgett, D. M.1
- Chapman, Charles Hiram, 1859 1
- Dryden, James, 1863 1
- Hosmer, Ralph S. (Ralph Sheldon), 1874 19631
- Hughes, Megan1
- Johnson, Albert Lynn1
- Lunn, A. G. (Alfred Gunn), 1883 1
- Mohr, Charles (Charles Theodore), 1824 19011
- Newell, Frederick Haynes, 1862 19321
- Oregon Agricultural Experiment Station1
- Oregon State University. Extension Service1
- Sudworth, George Bishop, 1862 19271
- Taylor, Frederick Winslow, 1856 19151
- Toumey, James W. (James William), 1865 19321