- Oregon State College. Extension Service23
- Oregon Agricultural College. Experiment Station3
- Oregon Agricultural College. Extension Service3
- Lane County (Or.)2
- Oregon State Agricultural College. Agricultural Experiment Station2
- Oregon. Department Of Forestry2
- Polk County (Or.)2
- United States. Forest Service2
- Baker County (Or.)1
- Ballard, Frank Llewellyn1
- Barnes, Will C. (Will Croft)1
- Benton County (Or.)1
- Boals, Gordon Porter1
- Brandon, Vera Haskell1
- Breithaupt, L. R. (Le Roy), 1886 1
- Burghduff, A. E.1
- Burrier, A. S. (Arnold Stewart), 1902 19381
- Carey, Charles Henry1
- Clackamas County (Or.)1
- Columbia County (Or.)1