At first glance, one of the most heavily-oiled shorelines appears healthy three years after the nation's worst oil spill. Environmentalists say it's not what's above the water that's concerning them ... more 
At first glance, one of the most heavily-oiled shorelines appears healthy three years after the nation's worst oil spill. Environmentalists say it's not what's above the water that's concerning them as much as what lies beneath the surface. (April 19) less 
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Fri, Apr 19, 2013 10:15 AM EDT