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A Study in the Cost of Producing Milk on Four Dairy Farms, Located in Wisconsin, Michigan, Pennsylvania, and North Carolina
Morton Oscar CooperCornelius Morris BennettLillian M. Church
出版U.S. Department of Agriculture, 1920
URLhttp://books.google.com.hk/books?id=9l3wwsCkgfMC&hl=&source=gbs_api
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