- Oregon State University. Extension Service427
- Oregon State University. Agricultural Experiment Station118
- Oregon State College. Agricultural Experiment Station60
- Pacific Northwest Forest And Range Experiment Station (Portland, Or.)57
- United States. Forest Service57
- Pacific Northwest Cooperative Extension54
- Hart, John M. (John Mervyn), 1947 46
- Oregon. Forest Lands Research Center, Corvallis43
- Southwest Oregon Forestry Intensified Research Program. Adaptive Phase43
- Brook, Edward J.34
- Chelton, Dudley B.33
- Selker, John S.32
- Peterson, William T.31
- Brodeur, Richard D.30
- United States. Department Of Agriculture30
- Haggerty, Roy29
- Poinar, George, jr.27
- Washington State University. Extension27
- Washington State University. Cooperative Extension26
- Carrington, James C.25