- United States. Forest Health Protection24
- United States. Forest Service. Northern Region24
- James, Robert L.11
- United States. Forest Service8
- Kegley, Sandy4
- Oregon State University. Extension Service4
- Randall, Carol4
- Schwandt, John W.4
- United States. Forest Service. Pacific Northwest Region4
- Hagle, Susan K.3
- Sturdevant, Nancy J.3
- United States. Department Of Agriculture3
- Washington State University. Cooperative Extension3
- Hall, Frederick C.2
- Hart, John M. (John Mervyn), 1947 2
- Mccain, Cindy2
- Pacific Northwest Cooperative Extension2
- Strik, Bernadine C. (Bernadine Cornelia), 1962 2
- Trent, Andy2
- United States. Forest Service. Northern Region. State & Private Forestry2