- Oregon State University. Extension Service710
- Oregon State University189
- Pscheidt, Jay W.86
- Fisher, Glenn C.73
- Washington State University. Extension64
- Pacific Northwest Cooperative Extension61
- Oregon State University. Agricultural Experiment Station59
- University Of Idaho. Extension58
- Walton, Vaughn M.50
- Westigard, Peter H.50
- Dreves, Amy J.49
- Rondon, Silvia I.47
- Peachey, Ed45
- Olsen, Jeff L.43
- Peachey, Ronald Edward41
- Et Al.40
- Oregon State University. Department Of Horticulture38
- Southern Oregon Agricultural Experiment Station37
- Oregon State University. College Of Forestry32
- Hart, John M. (John Mervyn), 1947 31