Witt, Wallace de <br/><br/>
Bedrock geology of the evitts creek and Pattersons creek Quadrangles, Maryland, Pennsylvania, and West Virginia / 
by Wallace de Witt and George W. Colton. 
 -- Washington :   United States Government Printing Office,   1964 
 - 90 p. + map. -- 
 (Geological Survey Bulletin  ; 1173).
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geología<br/>Maryland<br/>Pennsylvania<br/>Virginia
<br/><br/><label>Universal Decimal Class. No.: </label>55(73)