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Kansas-Missouri-Iowa-Outcrop-Belt-Cyclothem-Outline.png - Bhugh
Underground water resources of Iowa (1912) (14583588047).jpg - Fæ
Underground water resources of Iowa (1912) (14583586077).jpg - Fæ
Decorah Formation in Decorah Iowa.jpg - Wilson44691
Cummingsville Formation Decorah Iowa.jpg - Wilson44691
Platteville Limestone Decorah.jpg - Wilson44691
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