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MLA

Ball, Carleton R. (Carleton Roy), and J. Allen (Jacob Allen) Clark. Growing hard spring wheat. U.S. Dept. of Agriculture, 1915.

APA

Ball, Carleton R. (Carleton Roy), and Clark, J. Allen (Jacob Allen). (1915). Growing hard spring wheat. U.S. Dept. of Agriculture.

Chicago

Ball, Carleton R. (Carleton Roy), and J. Allen (Jacob Allen) Clark. Growing hard spring wheat. U.S. Dept. of Agriculture, 1915.