- Oregon. Forest Lands Research Center, Corvallis12
- Oregon State University. Cooperative Extension Service11
- Pacific Northwest Forest And Range Experiment Station (Portland, Or.)9
- Upper Willamette Resource Conservation And Development Project8
- Oregon State College. Federal Cooperative Extension Service6
- Oregon State University. Agricultural Experiment Station6
- Oregon. State Game Commission. Fishery Division6
- Demory, Darrell5
- Oregon State University. Federal Cooperative Extension Service5
- Oregon. Fish Commission5
- Cruickshank, E. Douglas4
- Oregon State University. Cooperative Extension Service4
- Pacific Northwest Cooperative Extension4
- Gilkey, Helen M., 1886 19723
- Johnston, L. D. (la Rea Dennis)3
- Oregon State Game Commission3
- Oregon State University. Forest Research Laboratory3
- Snow, C. Dale3
- Spada, Benjamin3
- Strawn, Bernice3