PEARRE, Nancy C.
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).
Delaware
Maryland
Pennsylvania
Yacimientos de cromo
553.46(73)
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).
Delaware
Maryland
Pennsylvania
Yacimientos de cromo
553.46(73)