File: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 (IA geologicalmapofw00owen).pdf
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![File: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 (IA geologicalmapofw00owen).pdf](https://upload.wikimedia.org/wikipedia/commons/thumb/5/51/Geological_map_of_Wisconsin%2C_Iowa_and_Minnesota_-_exhibiting%2C_also%2C_the_extension_of_the_Iowa_coal-field_into_Missouri%2C_and_its_relation_to_the_Illinois_coal-field_%28IA_geologicalmapofw00owen%29.pdf/page1-718px-thumbnail.pdf.jpg?20210110020253)
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