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Date: 2015-03-30 07:32:52Natural gas Energy Proppants and fracking fluids Marcellus Formation Shale oil extraction Frack Hydraulic fracturing in the United States Tight oil Tight gas Petroleum Hydraulic fracturing Shale gas | Health & Fracking The impacts & opportunity costs 2Add to Reading ListSource URL: www.medact.orgDownload Document from Source WebsiteFile Size: 1,16 MBShare Document on Facebook |