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MLA

Clark, Charles H. (Charles Henry). Seed-flax production. U.S. Dept. of Agriculture, 1917.

APA

Clark, Charles H. (Charles Henry). (1917). Seed-flax production. U.S. Dept. of Agriculture.

Chicago

Clark, Charles H. (Charles Henry) Seed-flax production. U.S. Dept. of Agriculture, 1917.