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WASHINGTON, DC - May 12: John Watson, chairman and CEO of Chevron Corp.; Marvin Odum, U.S. President of Shell Oil Co.; H. Lamar McKay, chairman and president of BP America Inc.; James Mulva, chairman and CEO of ConocoPhillips; and Rex Tillerson, chairman and CEO of Exxon Mobil Corp.; during the Senate Finance hearing on oil and gas tax incentives. (Photo by Scott J. Ferrell/Congressional Quarterly)

WASHINGTON, DC - May 12: John Watson, chairman and CEO of Chevron Corp.; Marvin Odum, U.S. President of Shell Oil Co.; H. Lamar McKay, chairman and president of BP America Inc.; James Mulva, chairman and CEO of ConocoPhillips; and Rex Tillerson, chairman and CEO of Exxon Mobil Corp.; during the Senate Finance hearing on oil and gas tax incentives. (Photo by Scott J. Ferrell/Congressional Quarterly)

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