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1999. 2002-06-01T04:00:00Z. 2005-02-18T21:44:54Z. Geological Survey (U.S.). The Survey ; Information Services [distributor]. English. Public. Great Basin. Quaternary.
1999. 2009-09-10T15:24:51Z. 2011-03-29T15:22:34Z. Attig, John W. Wisconsin Geological and Natural History Survey, University of Wisconsin-Extension. English. Public. Wisconsin and Oconto County. Quaternary.
1999. 2008-10-30T17:25:51Z. 2011-03-28T23:36:24Z. Ohio. Division of Geological Survey. Ohio Dept. of Natural Resources, Division of Geological Survey. English. Public. Ohio. Quaternary.