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St. Paul, Minn.

Science of cleaning oil from ocean marshes

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Louisiana coast
Oil from the Deepwater Horizon spill pools against the Louisiana coast along Barataria Bay June 8, 2010.
Charlie Riedel/ASSOCIATED PRESS
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Louisiana coast
Oil from the Deepwater Horizon spill pools against the Louisiana coast along Barataria Bay June 8, 2010.
Charlie Riedel/ASSOCIATED PRESS