A pumpjack brings oil to the surface in the
| By Reuters
A pumpjack brings oil to the surface in the Monterey Shale, California, in this file photo dated April 29, 2013. REUTERS/Lucy Nicholson
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A pumpjack brings oil to the surface in the Monterey Shale, California, in this file photo dated April 29, 2013. REUTERS/Lucy Nicholson