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MLA

Black, W. H, and V. V Parr. Feed-lot and ranch equipment for beef cattle . U.S. Dept. of Agriculture, 1929.

APA

Black, W. H, and Parr, V. V. (1929). Feed-lot and ranch equipment for beef cattle. U.S. Dept. of Agriculture.

Chicago

Black, W. H., and V. V Parr. Feed-lot and ranch equipment for beef cattle . U.S. Dept. of Agriculture, 1929.