Pennsylvania Geological Survey

#	Item
121	U.S. DEPARTMENT OF THE INTERIOR U.S. GEOLOGICAL SURVEY Add to Reading List Source URL: pubs.usgs.gov Language: English - Date: 2001-01-23 11:19:50 Geology of Pennsylvania Stone Sandstone Geology of West Virginia Clinton Group Limestone Eramosa Tuscarora Formation Bend Arch–Fort Worth Basin Geology Shale Sedimentology
122	PDF Document Add to Reading List Source URL: www.dcnr.state.pa.us Language: English - Date: 2013-02-25 14:42:13 Potash Industrial mineral Pennsylvania Geological Survey Mining Marcellus Formation Geology Geography of the United States Fertilizers
123	Untitled Add to Reading List Source URL: ag.udel.edu Language: English - Date: 2004-01-15 13:39:00 Tropical Storm Henri Delaware Geological Survey Delaware River Hurricane Floyd Hurricane Agnes Geography of the United States Geography of Pennsylvania Red Clay Creek