Berryhill, Henry L.  1921-2013 <br/><br/>
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).
<br/><br/><label>Subjects--Topical Terms: </label><br/>Pennsylvania<br/>Rocas Sedimentarias
<br/><br/><label>Universal Decimal Class. No.: </label>552.5(748)