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Date: 2015-04-20 15:32:39Building biology Matter Chemical elements Physics Hydraulic fracturing Shale gas Natural gas Marcellus Formation Health effects of radon Radon Soil contamination Chemistry | Increased levels of radon in Pennsylvania homes correspond to onset of frackingAdd to Reading ListSource URL: phys.orgDownload Document from Source WebsiteFile Size: 194,08 KBShare Document on Facebook |