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West Virginia Geology - Karst Regions
From the site: "Karst regions derived from 1968 geological map of West Virginia. In 1968 the West Virginia Geological and Economic Survey (WVGES) published a State Geologic Map.... -
Karst in the United States: A Digital Map Compilation and Database
From the site: "This report describes new digital maps delineating areas of the United States, including Puerto Rico and the U.S. Virgin Islands, having karst or the potential...