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http://www.truthdig.com/report/print/oh_canadas_become_a_home_for_record_fracking_20111228/

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http://www.economist.com/node/21541718/print

http://www.truth-out.org/print/10738

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http://www.truth-out.org/print/10751

http://www.commondreams.org/headline/2011/12/28-6?print