(PD) Photo: U.S. Dept. of Energy BP refinery at Texas City, Texas in 2005
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(PD) Photo: U.S. Chemical Safety Board BP refinery at Texas City, Texas in 2005
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(PD) Photo: U.S. Chemical Safety Board Delek refinery at Tyler, Texas in 2008
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(PD) Photo: U.S. Chemical Safety Board Caribbean Petroleum refinery at Puerto Rico in 2009
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