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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1976. 2019-01-17T15:00:38Z. 2019-01-18T13:18:31Z. Ministerstvo geologii Kazkhskoĭ SSR,Moskovskii gosudarstvennyi universitet im. M. V. Lomonosova. Russian. cartographic image. Public. Kazakhstan. Devonian and Ordovician.
1979. 2014-09-10T17:26:37Z. 2021-06-01T21:36:14Z. Weir, Gordon W. (Gordon Whitney), 1922-2011. U.S. Geological Survey. English. Public. Kentucky and Kentucky. Ordovician and From 425 to 500 million years ago.
1995. 2008-11-11T14:59:59Z. 2011-03-28T23:37:56Z. Swinford, E. Mac. Ohio Dept. of Natural Resources, Division of Geological Survey. English. Public. Ohio and Bellefontaine Region. Ordovician, Silurian, and Quaternary.
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.
1971. 2018-04-20T18:43:31Z. 2021-05-04T22:29:48Z. Parker, Mary Combs. Iowa Geological Survey. English. cartographic image. Public. Iowa and Iowa. Ordovician and From 425 to 500 million years ago.
1948. 2018-01-30T14:30:37Z. 2018-01-30T14:30:37Z. Cohee, George Vincent, 1907-. U.S. Geological Survey. English. cartographic image. Public. Michigan Basin (Mich. and Ont.), North America, and Michigan Basin. Ordovician, Silurian, and From 405 to 500 million years ago.