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MLA

Pierce, W. Dwight (William Dwight). How insects affect the cotton plant and means of combating them. U.S. Dept. of Agriculture, 1917.

APA

Pierce, W. Dwight (William Dwight). (1917). How insects affect the cotton plant and means of combating them. U.S. Dept. of Agriculture.

Chicago

Pierce, W. Dwight (William Dwight) How insects affect the cotton plant and means of combating them. U.S. Dept. of Agriculture, 1917.