Economic Geology of the United States . By Heinrich Ries, A.M., Ph.D., Assistant Professor of Economic Geology at Cornell University. New York, The Macmillan Company. 1905. | Zendy

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Economic Geology of the United States . By Heinrich Ries, A.M., Ph.D., Assistant Professor of Economic Geology at Cornell University. New York, The Macmillan Company. 1905.

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