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Changes in Farm Production and Efficiency, 1977

Donald Douglas DurostUnited States. Department of Agriculture. Economic Research Service. National Economic Analysis DivisionEvelyn T. Black

出版	Department of Agriculture, Economic Research Service, [National Economic Analysis Division], 1977
URL	http://books.google.com.hk/books?id=CgxqByZe_84C&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN