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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1972. 2018-10-22T17:28:12Z. 2021-09-27T14:42:35Z. Akademii︠a︡ nauk SSSR. Sibirskoe otdelenie. Akademiia Nauk & GUGK. Russian. cartographic image. Public. Cambrian and From 500 to 570 million years ago.
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.
1945. 2018-02-20T15:02:08Z. 2018-02-20T15:02:08Z. Cohee, George Vincent, 1907-. U.S. Geological Survey. English. cartographic image. Public. Michigan Basin (Mich. and Ont.), North America, and Michigan Basin. Ordovician, Cambrian, and From 425 to 570 million years ago.
2008. 2008-11-11T15:36:27Z. 2012-04-26T14:16:08Z. Ryder, Robert T. U.S. Dept. of the Interior, U.S. Geological Survey ; For sale by U.S. Geological Survey, Information Services. English. Public. Appalachian Basin and Appalachian Basin. Cambrian and Ordovician.
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.