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MLA

Drake, J. A. A corn-belt farming system which saves harvest labor by hogging down crops. U.S. Dept. of Agriculture, 1914.

APA

Drake, J. A. (1914). A corn-belt farming system which saves harvest labor by hogging down crops. U.S. Dept. of Agriculture.

Chicago

Drake, J. A. A corn-belt farming system which saves harvest labor by hogging down crops. U.S. Dept. of Agriculture, 1914.