- Oregon State University. Extension Service4
- Hatch, Duane Leroy3
- Baggett, James R.1
- Bouquet, A. G. B. (Arthur George Bristow), 1885 1
- Enzie, Walter Denton1
- Hemphill, D. D.1
- Mansour, N. S.1
- Oregon Agricultural College. Experiment Station1
- Oregon State College. Agricultural Experiment Station1
- Oregon State University. Agricultural Experiment Station1
- Pacific Northwest Cooperative Extension1
- Pernot, E. F. (Emile Francis), 18591
- Raab, Carolyn A.1
- Tello Lopez, Edgar Eduardo1
- United States. Department Of Agriculture1
- University Of Idaho. Extension1
- Varseveld, George1
- Washington State University. Extension1