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Poultry Grading Manual

Ashley R. GulichGertrude L. WarrenHenry Walter GilbertsonOrvis F. JohndrewWoot-tsuen Wu LeungWilliam Eugene HauverBernice Kunerth WattRebecca Koonce Pecot

出版	U.S. Department of Agriculture, 1951
URL	http://books.google.com.hk/books?id=MBl0n_WVag0C&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN