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"HARRISBURG &amp;#x2013; Advances in hydraulic fracturing technology have powered the American natural gas boom. And now hydraulic fracturing could be increasingly powered by the very fuel it has been s..."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.observer-reporter.com/article/20130120/NEWS080101/130129986/0/LIFESTYLES05>