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MLA

Geib, H. V. (Horace Valentine). Strip cropping to prevent erosion. U.S. Dept. of Agriculture, 1931.

APA

Geib, H. V. (Horace Valentine). (1931). Strip cropping to prevent erosion. U.S. Dept. of Agriculture.

Chicago

Geib, H. V. (Horace Valentine) Strip cropping to prevent erosion. U.S. Dept. of Agriculture, 1931.