Cite

Citation Info Geological and Natural History Survey of Minnesota. Winchell, Alexander, 1824-1891. Winchell, N. H. (Newton Horace), 1839-1914. (1887). Preliminary geological map of the iron bearing rocks of the northeastern part of Minnesota. [JPEG]. Geological and Natural History Survey of Minnesota ; St. Paul, Minnesota. Retrieved from https://geo.nyu.edu/catalog/p16022coll247:251

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