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Research Bulletin

Arthur B. MackieBeatrice Elizabeth DonaldsonEarl Orel HeadyGeoffrey Seddon ShepherdAllen Baker RichardsAlvin Charles EgbertGerald W. DeanGrace Melvina AugustineHerbert B. HowellLaurel D. LoftsgardStanley BallounRoland J. Hildreth

出版	Agricultural Experiment Station, Iowa State College, 1956
URL	http://books.google.com.hk/books?id=0sdQAQAAMAAJ&hl=&source=gbs_api