PATTERSON, Elmer D. <br/><br/>
Coal resources of beaver county Pennsylvania / 
by Elmer D. Patterson. 
 -- Washington :   United States Government Printing Office,   1963 
 - 33 p. + map. -- 
 (Geological Survey Bulletin  ;  1143-A).
<br/><br/><label>Subjects--Topical Terms: </label><br/>Carbón<br/>Pennsylvania
<br/><br/><label>Universal Decimal Class. No.: </label>552.574(748)