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Date: 2013-01-17 09:15:21Shale gas Geography of the United States Natural gas United States Marcellus Formation Proppants and fracking fluids Frack Hydraulic fracturing in the United States Shale gas in the United States Hydraulic fracturing Shale Geology | Summit Discusses Public Health Implications of FrackingAdd to Reading ListSource URL: ehp.niehs.nih.govDownload Document from Source WebsiteFile Size: 88,70 KBShare Document on Facebook |