PEARRE, Nancy C. <br/><br/>
Chromite and other mineral deposits in serpentine rocks of the Piedmont upland Maryland, Pennsylvania and Delaware / 
by Nancy C. Pearre and Allen V. Heyl. 
 -- Washington :   United States Government Printing Office,   1960 
 - P. 707-833 + map. -- 
 (Geological Survey Bulletin  ;  1082-K).
<br/><br/><label>Subjects--Topical Terms: </label><br/>Delaware<br/>Maryland<br/>Pennsylvania<br/>Yacimientos de cromo
<br/><br/><label>Universal Decimal Class. No.: </label>553.46(73)