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MLA

Weir, Wilbert Walter. A study of the value of crop rotation in relation to soil productivity . U.S. Dept. of Agriculture, 1926.

APA

Weir, Wilbert Walter. (1926). A study of the value of crop rotation in relation to soil productivity. U.S. Dept. of Agriculture.

Chicago

Weir, Wilbert Walter A study of the value of crop rotation in relation to soil productivity . U.S. Dept. of Agriculture, 1926.