Geological map of Wisconsin, Iowa and Minnesota : exhibiting, also, the extension of the Iowa coal-field into Missouri, and its relation to the Illinois coal-field
Engraved by W. Smith, Washn." Inset: "Geological map of the north shore of Lake Superior : on the scale of the original m.s. map. 110 x 66 centimeters Scale approximately 1:1,230,000 General Map Collection
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