- U.S. International Biological Program. Coniferous Forest Biome50
- University Of Washington41
- United States. Forest Service. Northern Region. State & Private Forestry17
- United States. Forest Service. Northern Region10
- Welch, E. B. (Eugene B.)9
- James, Robert L.6
- Wydoski, Richard S.6
- Bousfield, Wayne E.5
- Gibson, Kenneth E.5
- Ugolini, Fiorenzo C.5
- Burgner, Robert Louis, 1919 4
- Dooling, Oscar J.4
- Spyridakis, Dimitri E.4
- Taub, F. B. (Frieda B.)4
- Tunnock, Scott4
- Whitney, Richard R.4
- Edmonds, Robert L.3
- Forest Products Laboratory (U.S.)3
- Gessel, Stanley P.3
- Gregory, S. V.3