Category:Old geological maps of Iowa

Media in category "Old geological maps of Iowa"

The following 2 files are in this category, out of 2 total.

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  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 4,133 × 3,450, 2 pages; 3.78 MB
  
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  Underground water resources of Iowa (1912) (14789940993).jpg 3,582 × 2,468; 1.83 MB