- U.S. International Biological Program. Coniferous Forest Biome72
- University Of Washington64
- Pacific Northwest Forest And Range Experiment Station (Portland, Or.)49
- Oregon State University. Extension Service22
- Moravets, F. L.18
- Pacific Northwest Forest Experiment Station (Portland, Or.)11
- Welch, E. B. (Eugene B.)10
- Buell, Edward D.8
- Oregon State University. Forest Research Laboratory8
- Spada, Benjamin7
- Oregon. Dept. Of Geology And Mineral Industries6
- Wydoski, Richard S.6
- Hart, John M. (John Mervyn), 1947 5
- North Cascades Conservation Council5
- Ugolini, Fiorenzo C.5
- United States. Forest Service. Pacific Northwest Region5
- Burgner, Robert Louis, 1919 4
- Emmingham, William H.4
- Gara, Robert I.4
- Oregon State University. Agricultural Experiment Station4