| http://www.w3.org/ns/prov#value | - laska's Exxon Valdez Oil Spill Trustee Council,[6] the National Oceanic and Atmospheric Administration and environmental groups such as Greenpeace and the Sierra Club.[5][10][11] Some groups, such as Defenders of Wildlife, dispute the official estimates, maintaining that the volume of the spill, which was calculated by subtracting the volume of material removed from the vessel's tanks after the sp
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