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MLA

Snelling, Ralph O. Resistance of sorghums to the chinch bug . U.S. Dept. of Agriculture, 1937.

APA

Snelling, Ralph O. (1937). Resistance of sorghums to the chinch bug. U.S. Dept. of Agriculture.

Chicago

Snelling, Ralph O. Resistance of sorghums to the chinch bug . U.S. Dept. of Agriculture, 1937.