- Thomas, M. D.[remove]21
- Oregon State College. Federal Cooperative Extension Service18
- Breithaupt, L. R. (Le Roy), 1886 14
- Nielsen, N. I.10
- Dahl, F. H.5
- Horrell, Elvera4
- Oregon State University. Cooperative Extension Service3
- Borum, C. J.1
- Churchill, John R.1
- Coyle, B. W.1
- Maddox, Russell1
- Neilsen, N. I.1