Oregon State College. Federal Cooperative Extension Service; Zeller, S. M.; Clark, R. Ralph(Corvallis, Or. : Federal Cooperative Extension Service, Oregon State College, 1947-01)
Oregon State College. Federal Cooperative Extension Service; McWhorter, O. T.; Zeller, S. M.; Rieder, R. E.(Corvallis, Or. : Federal Cooperative Extension Service, Oregon State College, 1945-08)
Oregon State College. Federal Cooperative Extension Service; McWhorter, O. T.; Zeller, S. M.(Corvallis, Or. : Federal Cooperative Extension Service, Oregon State College, 1940-03)
Oregon State College. Federal Cooperative Extension Service; Clark, R. Ralph; Zeller, S. M.(Corvallis, Or. : Federal Cooperative Extension Service, Oregon State College, 1946-04)
Oregon State College. Federal Cooperative Extension Service; Zeller, S. M.; McWhorter, O. T.(Corvallis, Or. : Federal Cooperative Extension Service, Oregon State College, 1939-03)
