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COVINGTON, La. (AP) – The Gulf oil spill has surpassed the Exxon Valdez as the worst in U.S. history, according to new estimates released Thursday, but the Coast Guard and BP said an untested procedure to stop it seemed to be working.

A team of scientists trying to figure out how much oil has been flowing since the offshore rig Deepwater Horizon exploded April 20 and sank two days later …