Creator
- Oregon State University. College Of Forestry87
- Klamath Falls Resource Area80
- Oregon Agricultural College. Extension Service78
- United States. Agricultural Research Service77
- Oregon State Agricultural College. Extension Service73
- Oregon Agricultural Experiment Station69
- Institute For Natural Resources67
- Washington State University. Cooperative Extension67
- Pacific Northwest Forest And Range Experiment Station (Portland, Or.)61
- University Of Idaho. Cooperative Extension Service52
- United States. Forest Service. Northern Region46
- Upper Willamette Resource Conservation And Development Project46
- Washington State University. Extension43
- James, Robert L.42
- Oregon State University. Malheur Experiment Station42
- United States. Forest Service. Northern Region. State & Private Forestry41
- Columbia Basin Agricultural Research Center39
- Et Al.38
- University Of Idaho. Extension37
- Powers, W. L. (Wilbur Louis), 188735