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1976. 2012-06-29T15:21:05Z. 2021-05-04T22:57:32Z. Geological Survey (U.S.). The Survey. English. Public. Maryland and West Virginia.
1976. 2018-05-29T18:37:34Z. 2018-05-29T18:37:34Z. Cardwell, Dudley H., cartographer. West Virginia Geological Survey,Williams & Heintz Map Corporation. English. cartographic image. Public. West Virginia and West Virginia.
1976. 2012-08-10T13:21:42Z. 2013-03-18T22:10:51Z. Geological Survey (U.S.). The Survey. English. Public. Maryland and West Virginia.