File:Geology and underground waters of southern Minnesota (IA geologyundergrou00hall).pdf
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![File:Geology and underground waters of southern Minnesota (IA geologyundergrou00hall).pdf](https://upload.wikimedia.org/wikipedia/commons/thumb/3/3c/Geology_and_underground_waters_of_southern_Minnesota_%28IA_geologyundergrou00hall%29.pdf/page1-380px-Geology_and_underground_waters_of_southern_Minnesota_%28IA_geologyundergrou00hall%29.pdf.jpg?20200816071229)
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