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In this March 29, 2013, file photo, workers tend to a well head during a hydraulic fracturing operation at an Encana Oil & Gas (USA) Inc. gas well outside Rifle, Colo. Discoveries of vast reserves of oil and the slow progress of alternatives in recent years has given rise to a very different outlook on oil prices. (AP Photo/Brennan Linsley, File)-FILE
Photo by: Brennan Linsley
In this March 29, 2013, file photo, workers tend to a well head during a hydraulic fracturing operation at an Encana Oil & Gas (USA) Inc. gas well outside Rifle, Colo. Discoveries of vast reserves of oil and the slow progress of alternatives in recent years has given rise to a very different outlook on oil prices. (AP Photo/Brennan Linsley, File)-FILE

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