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"The U.S. Interior Department said it will unveil new proposals about the components in hydraulic fracturing fluid to allay public concerns about shale gas."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.upi.com/Business_News/Energy-Industry/2011/11/01/US-may-revise-some-shale-gas-rules/UPI-20811320147995/?rel=44821320401700>