- Oregon State University. Extension Service104
- Oregon State University. Agricultural Experiment Station61
- United States. Forest Service30
- Kennedy, Robert E.17
- Stebbins, Robert L.17
- Tanguay, Robert L.17
- Pacific Northwest Cooperative Extension15
- Upper Willamette Resource Conservation And Development Project15
- Harris, Robert N.14
- Oregon State College. Agricultural Experiment Station14
- Southwest Oregon Forestry Intensified Research Program. Adaptive Phase13
- Dziak, Robert P.12
- Hannah, Robert W.12
- Hughes, Robert M.12
- Graham, Robert D.11
- Pacific Northwest Forest And Range Experiment Station (Portland, Or.)11
- Brodeur, Richard D.10
- Cohen, Warren B.10
- Hart, John M. (John Mervyn), 1947 10
- Miller, Robert N.10