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MLA

Kell, Walter V, and Grover F Brown. Strip cropping for soil conservation. U.S. Dept. of Agriculture, 1937.

APA

Kell, Walter V, and Brown, Grover F. (1937). Strip cropping for soil conservation. U.S. Dept. of Agriculture.

Chicago

Kell, Walter V., and Grover F Brown. Strip cropping for soil conservation. U.S. Dept. of Agriculture, 1937.