Oregon State University. Extension Service; Washington State University. Extension; University of Idaho. Extension; Hepworth, Homer M.; Guelette, Lee O.([Covallis, Or.] : Oregon State University Extension Service, 1977-04)
Oregon State University. Extension Service.; Zimmerman, Martin (Martin Joseph); Hepworth, Homer M.(Corvallis, Or. : Extension Service, Oregon State University, 1977)
