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A technician takes a sample of crude oil from a well operated by Venezuela's state-owned oil company PDVSA in Morichal, Venezuela, on July 28, 2011.
A technician takes a sample of crude oil from a well operated by Venezuela's state-owned oil company PDVSA in Morichal, Venezuela, on July 28, 2011.

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Oil: Ties that bind U.S. and Venezuela

Recent refinery explosions in Venezuela raise questions about its oil industry. CNN's Rafael Romo reports.

Oil: Ties that bind U.S. and Venezuela

Recent refinery explosions in Venezuela raise questions about its oil industry. CNN's Rafael Romo reports.