- Oregon State University. Extension Service128
- Oregon State University. Cooperative Extension Service77
- Oregon State University. Agricultural Experiment Station26
- Jackman, E. R.15
- Jackman, E. R. (Edwin Russell), 1894 196715
- Oregon State College. Agricultural Experiment Station14
- Mcguire, William S.11
- Mack, H. J.10
- U.S. International Biological Program. Coniferous Forest Biome10
- United States. Forest Service. Pacific Northwest Region10
- Hannaway, D. B.8
- Cornett, Elgin7
- Dyrness, C. T.7
- Ross, Jackson7
- University Of Washington7
- Frazier, W. A.6
- Baggett, James R.5
- Crowell, H. H.5
- Hart, John M. (John Mervyn), 1947 5
- Institute For Natural Resources5