Geology
Rock and mineral science
Geology of Nottingham County Park
Anonymous (not verified)
Floras of the Serpentinite Formations in Eastern North America, with Descriptions of Geomorphology and Mineralogy of the Formations
Anonymous (not verified)
Chromite and other mineral deposits in serpentine rocks of the Piedmont Upland, Maryland, Pennsylvania, and Delaware
Anonymous (not verified)
The history of chromite mining in Pennsylvania and Maryland
Anonymous (not verified)
Preliminary Report on the Chromite Occurrence at the Wood Mine, Pennsylvania
Anonymous (not verified)