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  • Perennial ryegrass seed crop management in northwest Washington 

    Brauen, Stanton E. (Stanton Elwood), 1932-; Peabody, Dwight V.; Davison, Arlen D. (Arlen Durant); Turner, Darrell O.; Hayes, David; VanderHave, D. J.; Ovenell, Lyle; Reese, Elmer (Pullman, Washington : Washington State University. Extension., 1974-05)