- Pacific Northwest Forest And Range Experiment Station (Portland, Or.)31
- United States. Forest Service. Pacific Northwest Region. Thirty Year Club31
- Oregon State University. Forest Research Laboratory15
- Oregon State University. Extension Service14
- Pacific Northwest Cooperative Extension8
- Oregon State University. College Of Forestry7
- University Of Idaho. Extension7
- Washington State University. Extension7
- Hann, David W.5
- Pacific Northwest Coastal Ecosystems Regional Study5
- Pacific Northwest Forest Experiment Station (Portland, Or.)5
- United States. Forest Service5
- United States. Forest Service. Pacific Northwest Region5
- Meyer, Walter H. (Walter Huber)3
- Williams, Gerald W.3
- Bruce, Donald, B. 18842
- Dobkowski, Alexander2
- Forest Research Council Of The Pacific Northwest2
- Hanus, Mark L.2
- Johnson, Norman E.2