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MLA

Derr, H. B. Barley : growing the crop . U.S. Dept. of Agriculture, 1911.

APA

Derr, H. B. (1911). Barley : growing the crop. U.S. Dept. of Agriculture.

Chicago

Derr, H. B. Barley : growing the crop . U.S. Dept. of Agriculture, 1911.