1979. 2018-05-15T17:40:01Z. 2018-09-05T19:38:09Z. Potts, Roger B. Kentucky Geological Survey. English. cartographic image. Public. Kentucky and Kentucky.
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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.