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Oil pipelines, pumping rigs, and electrical transmission lines dot the landscape along California's "Petroleum Highway" (Highway 33) running along the northwestern side of the San Joaquin Valley.

U.S. oil surged to the highest level since 2008 Thursday before reversing course as the market weighs supply disruptions from Russia against a possible Iran nuclear deal.

West Texas Intermediate crude futures, the U.S. oil benchmark, traded as high as $116.57 per barrel, a price last seen on Sept. 22, 2008. International benchmark Brent crude hit $119.84, the highest level since May 2012.

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