- Oregon State University. Extension Service320
- Oregon State University. Agricultural Experiment Station103
- Oregon State College. Federal Cooperative Extension Service52
- Oregon State College. Agricultural Experiment Station39
- Upper Willamette Resource Conservation And Development Project38
- Pacific Northwest Cooperative Extension36
- Southwest Oregon Forestry Intensified Research Program. Adaptive Phase34
- Hart, John M. (John Mervyn), 1947 33
- Chelton, Dudley B.28
- Peterson, William T.28
- Brodeur, Richard D.26
- Barth, John A.25
- Selker, John S.25
- United States. Department Of Agriculture24
- United States. Forest Service23
- Washington State University. Cooperative Extension23
- Oregon. Forest Lands Research Center, Corvallis22
- Brook, Edward J.21
- Moum, J. N.21
- Haggerty, Roy20