1990. 2002-06-01T04:00:00Z. 2020-10-16T18:55:23Z. Geological Survey (U.S.). U.S. Geological Survey ; For sale by Map Distribution. English. Public. Middle West. Precambrian.
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2001. 2002-06-01T04:00:00Z. 2023-02-11T04:46:16Z. Geological Survey (U.S.). The Survey ; For sale by USGS Information Services (Open-File Report Sales). English. Public. Middle West. Precambrian.