http://pec.lib.wvu.edu/record/P10801953?Log of field trip, May 17-18, 1952 : joint meeting Appalachian Geological Society and Engineers' Society of Western Pennsylvania Oil and Gas Section. Pamphlet. "Sponsored by the West Virginia Geological and Economic Survey." Appalachian Geological Society.West Virginia Geological and Economic Survey.Geology, Stratigraphic--Devonian.Geology--Virginia.Geology--West Virginia.14256