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http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	Originally published on January 25, 2012 11:25 am The practice of hydraulic fracturing ??? pumping fluid into underground rock to push up natural gas ??? has its detractors, especially among environmentalists.
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