Berryhill, Henry L. 1921-2013
Coal-bearing upper Pennsylvanian and lower Permian rocks, Wasshington area, Pennsylvania / by Henry L. Berryhill, Stanley P. Schweinfurth and Bion H. Kent. -- Washington : United States Government Printing Office, 1971 - 47 p. + map. -- (Geological Survey Professional Paper ; 621).
Pennsylvania
Rocas Sedimentarias
552.5(748)
Coal-bearing upper Pennsylvanian and lower Permian rocks, Wasshington area, Pennsylvania / by Henry L. Berryhill, Stanley P. Schweinfurth and Bion H. Kent. -- Washington : United States Government Printing Office, 1971 - 47 p. + map. -- (Geological Survey Professional Paper ; 621).
Pennsylvania
Rocas Sedimentarias
552.5(748)