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"Maintaining a flat level of natural gas production from U.S. shale deposits is an elusive prospect, an energy policy director told U.S. lawmakers."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.upi.com/Business_News/Energy-Industry/2013/05/22/US-senators-hear-mixed-assessment-of-shale/UPI-49411369224051/>