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.
1892. 2013-10-29T16:36:20Z. 2013-11-21T21:26:22Z. U.S. Coast and Geodetic Survey, issuing body. U.S. Coast and Geodetic Survey. English. Public. Middle West.
1893. 2013-10-30T18:49:38Z. 2013-11-21T21:26:37Z. U.S. Coast and Geodetic Survey, issuing body. U.S. Coast and Geodetic Survey. English. Public. Middle West.
1894. 2013-10-31T17:25:40Z. 2013-11-21T21:26:53Z. U.S. Coast and Geodetic Survey, issuing body. U.S. Coast and Geodetic Survey. English. Public. Middle West.
1890. 2013-10-25T15:20:13Z. 2013-11-21T21:27:54Z. U.S. Coast and Geodetic Survey, issuing body. U.S. Coast and Geodetic Survey. English. Public. Colorado and Middle West.
1891. 2013-10-28T18:03:48Z. 2013-11-21T21:28:11Z. U.S. Coast and Geodetic Survey, issuing body. U.S. Coast and Geodetic Survey. English. Public. Middle West.
1890. 2013-10-25T15:23:47Z. 2013-11-21T21:29:15Z. U.S. Coast and Geodetic Survey, issuing body. U.S. Coast and Geodetic Survey. English. Public. Middle West.
1891. 2013-10-28T18:12:50Z. 2013-11-21T21:29:29Z. U.S. Coast and Geodetic Survey, issuing body. U.S. Coast and Geodetic Survey. English. Public. Middle West.
1991. 2002-06-01T04:00:00Z. 2002-06-01T04:00:00Z. Geological Survey (U.S.). U.S. Geological Survey ; For sale by Map Distribution. English. Public. Iowa and Middle West. Quaternary.