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How to Candle Eggs

Mary Engle PenningtonMinnie Kimball JenkinsHelen Molony Pennington Betts

出版	U.S. Department of Agriculture, 1918
URL	http://books.google.com.hk/books?id=m00WoAIAkXYC&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN