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MLA

Feustel, Irvin C. The acidic properties of peat and muck . U.S. Dept. of Agriculture, 1939.

APA

Feustel, Irvin C. (1939). The acidic properties of peat and muck. U.S. Dept. of Agriculture.

Chicago

Feustel, Irvin C. The acidic properties of peat and muck . U.S. Dept. of Agriculture, 1939.