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"The United States and China are among the nations with the most-abundant reserves of shale oil and shale natural gas, the U.S. Department of Energy said Monday."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.upi.com/Business_News/2013/06/10/US-China-enjoy-ample-shale-oil-gas-reserves/UPI-57111370877079/>