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Cost of Producing Wheat

Martin Reese CooperR. S. Washburn

出版	U.S. Department of Agriculture, 1921
URL	http://books.google.com.hk/books?id=hrOc7n0v960C&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN

註釋

Of costs, by districts. pp. 13.