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The Relative Merits of Producing Creep-fed, Feeder, and Lot-fattened Calves in West Virginia

Charles Vinyard WilsonEarl W. McComas

出版	The Station, 1939
URL	http://books.google.com.hk/books?id=HjdoF2Js_vkC&hl=&source=gbs_api