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"Photo credit: ConocoPhillips One of the greatest challenges an oil and gas company faces is how much of the resources it finds can ultimately be recovered. Believe it or not, oil and gas"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.aol.com/article/2013/09/03/3-companies-cracking-the-code-to-unlock-more-oil/20710160/?gen=1>