Farm profits : 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-...
Washington, D.C, U.S. Dept. of Agriculture, 1920
1920
U.S. Department of Agriculture, National Agricultural Library
U.S. Department of Agriculture, National Agricultural Library
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