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Anna T. WinkCharles Oliver DunbarClare William PierceClarence Scott AndersonD. V. JosephsonJ. K. SternJohn Edward NicholasJonathan Winbourne WhitePaul I. WrigleyPennsylvania State College. Agricultural Experiment StationWilliam L. Barr

出版	Pennsylvania State College, School of Agriculture, Agricultural Experiment Station, 1944
URL	http://books.google.com.hk/books?id=kmBRAQAAMAAJ&hl=&source=gbs_api