http://d.yimg.com/a/p/ap/20100712/ca...EnFrUP_KTkzQ--AP - In a potentially pivotal moment in the Gulf crisis, BP was preparing Tuesday to begin closing valves in a slow and methodical process that could finally choke off the geyser of crude at the bottom of the sea after three gloomy months and up to 180 million gallons spilled.
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