- Oregon State University. Extension Service27
- Suryan, Robert M.27
- Samelson, R. M.24
- Oregon State College. Federal Cooperative Extension Service22
- Forest Products Laboratory (U.S.)21
- Et Al.20
- Letelier, Ricardo M.20
- Oregon State University. Agricultural Experiment Station19
- Lunden, Jeff D.17
- Mayer, Daniel F.17
- Meinzer, Frederick C.17
- Abbott, Mark R.15
- Bellantoni, L.15
- Mcgivern, C. L.15
- Schellman, H.15
- Thomas, M. D.15
- van Steenwyk, Robert A.15
- Breithaupt, L. R. (Le Roy), 1886 14
- Caldwell, Douglas R.14
- Jaiswal, Pankaj14