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Calculating Pork Production Costs and Returns in Your Pork Enterprise

Bunn, A. J. (Andy J.)F. A. KainsOntario. Ministry of Agriculture and Food

出版	Ontario Ministry of Agriculture and Food, 1993
URL	http://books.google.com.hk/books?id=dIwNNAEACAAJ&hl=&source=gbs_api