"West Virginia."; "Geological Survey (U. S.)"; "Geological Survey (U. S.)", "Geological Survey (U. S.). West Virginia Cooperative Fish and Wildlife Research Unit."; "Geological Survey (U. S.)"; "1999"; "

Pamphlet. \"USGS Fact Sheet 050-99, August 1999\".

"; ""; "P21151"; "pec"; "Geological Survey (U. S.). West Virginia Cooperative Fish and Wildlife Research Unit.", "Geological Survey (U. S.)"; "14256"; .