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Labor and Power Used for Farm Enterprises: Indiana, 1950

United States. Bureau of Agricultural EconomicsReuben William Hecht

出版	U.S. Department of Agriculture, Bureau of Agricultural Economics, 1952
URL	http://books.google.com.hk/books?id=fwp7k5Ky7lUC&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN