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Poultry Grading Manual

Orvis F. JohndrewWilliam Eugene Hauver

出版	U.S. Department of Agriculture, Production and Marketing Administration, Poultry Branch, 1952
URL	http://books.google.com.hk/books?id=E5hlV3w3sKQC&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN