1987. 2002-06-01T04:00:00Z. 2002-06-01T04:00:00Z. Geological Survey (U.S.). The Survey ; For sale by Branch of Distribution. English. Public. Northwest, Old. Ordovician and Cambrian.
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1997. 2002-06-01T04:00:00Z. 2004-04-05T13:49:07Z. Geological Survey (U.S.). U.S. Geological Survey ; For sale by Geological Survey Information Services. English. Public. Arkansas, Harrison Region, Ozark Mountains, and Missouri. Cambrian.
1992. 2002-06-01T04:00:00Z. 2002-06-01T04:00:00Z. Geological Survey (U.S.). The Survey ; For sale by Map Distribution. English. Public. Appalachian Basin. Cambrian and Ordovician.
1991. 2002-06-01T04:00:00Z. 2002-06-01T04:00:00Z. Geological Survey (U.S.). The Survey ; For sale by Map Distribution. English. Public. Appalachian Basin. Cambrian and Ordovician.
1989. 2002-06-01T04:00:00Z. 2004-04-05T13:41:13Z. Geological Survey (U.S.). The Survey ; a Denver, CO : For sale by Map Distribution. English. Public. Missouri. Mississippian and Cambrian.