Hydrographer Rachel Medley observes a sample from a water column sampler that was recovered from the Gulf of Mexico.
Hydrographer Rachel Medley observes a sample from a water column sampler that was recovered from the Gulf of Mexico. Chuck Cook / AP
Hydrographer Rachel Medley observes a sample from a water column sampler that was recovered from the Gulf of Mexico. Chuck Cook / AP

National

September 15, 2010 7:30 PM

NOAA head: Scientists' work on Gulf spill far from done

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