- Oregon State University. Agricultural Experiment Station4
- Boersma, L.2
- Lindstrom, F. T.2
- Beckwith, T. D. (Theodore Day), 1879 19461
- Cawlfield, David E.1
- Chao, Tsun Tien1
- Fang, Sheng Chung1
- Harward, M. E.1
- Oregon Agricultural College. Extension Service1
- Teeter, T. A. H. (Thomas Anderson Hendricks), 1886 1