Notes on the Geology and Iron Ores of the Cuyuna District, Minnesota. By E. C. Harder and A. W. Johnston. Bull. 660–A, U.S. Geol. Survey. pp. 26, with one map. 1917. | Zendy

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Notes on the Geology and Iron Ores of the Cuyuna District, Minnesota. By E. C. Harder and A. W. Johnston. Bull. 660–A, U.S. Geol. Survey. pp. 26, with one map. 1917.

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