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Date: 2012-10-22 14:49:46Hydraulic fracturing Barnett Shale Marcellus Formation Natural gas Air pollution Fossil fuel Utica Shale Shale gas Geography of the United States Geology Stratigraphy | Add to Reading ListSource URL: www.gasp-pgh.orgDownload Document from Source WebsiteFile Size: 713,95 KBShare Document on Facebook |