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MLA

Jacob, K. D. The Composition and distribution of phosphate rock with special reference to the United States . U.S. Dept. of Agriculture, 1933.

APA

Jacob, K. D. (1933). The Composition and distribution of phosphate rock with special reference to the United States. U.S. Dept. of Agriculture.

Chicago

Jacob, K. D. The Composition and distribution of phosphate rock with special reference to the United States . U.S. Dept. of Agriculture, 1933.