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Figures from the Same Farms for a Series of Years : Washington County, Ohio, 25 Farms, 1912-1918 ; Clinton County, Ind., 100 Farms, 1910 and 1913-1918 ; Dane County, Wis., 60 Farms, 1913-1917
出版U.S. Department of Agriculture, 1920
URLhttp://books.google.com.hk/books?id=RHFCAQAAMAAJ&hl=&source=gbs_api
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