NALDC

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MLA

Whitfield, Charles J, and John A Perrin. Sand-dune reclamation in the southern Great Plains. U.S. Dept. of Agriculture, 1939.

APA

Whitfield, Charles J, and Perrin, John A. (1939). Sand-dune reclamation in the southern Great Plains. U.S. Dept. of Agriculture.

Chicago

Whitfield, Charles J., and John A Perrin. Sand-dune reclamation in the southern Great Plains. U.S. Dept. of Agriculture, 1939.