- Oregon State University. Extension Service50
- Landgren, Chal G.18
- Landgren, Chal12
- Bondi, Michael C.9
- Oregon State University. College Of Forestry7
- Oregon State University. Forest Research Laboratory7
- North Willamette Research And Extension Center6
- Ketchum, Lynn5
- Emmingham, William H.4
- Oregon State University. Department Of Horticulture4
- Pacific Northwest Cooperative Extension4
- United States. Department Of Agriculture4
- Cooper, Alan3
- Elwood, Norman E.3
- Fletcher, Richard A.3
- Washington State University. Cooperative Extension3
- Duddles, Ralph E.2
- Fitzgerald, Stephen Arthur2
- Grotta, Amy T.2
- Hart, John M. (John Mervyn), 1947 2