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In this Tuesday, July 26, 2011, file photo, a worker hangs from an oil derrick outside of Williston, N.D. 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/Gregory Bull, File)
Photo by: Gregory Bull
In this Tuesday, July 26, 2011, file photo, a worker hangs from an oil derrick outside of Williston, N.D. 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/Gregory Bull, File)

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