1988. 2002-06-01T04:00:00Z. 2002-06-01T04:00:00Z. Geological Survey (U.S.). The Survey ; For sale by Map Distribution. English. Public. Missouri, Iron County, and Madison County. Precambrian.
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1988. 2002-06-01T04:00:00Z. 2002-06-01T04:00:00Z. Geological Survey (U.S.). U.S. Geological Survey ; For sale by Branch of Distribution. English. Public. Precambrian.
1988. 2008-09-04T14:38:41Z. 2011-03-25T22:16:52Z. Heck, Thomas J. North Dakota Geological Survey. English. Public. North Dakota. Precambrian.