"BP oil spill in the Gulf of Mexico" . . . "Exxon Valdez oil" . . . . . "Exxon Valdez spill" . . . "Valdez" . . . "Exxon Valdez spilled in 1989" . . "litigation ensuing after the ''Exxon Valdez'' disaster" . "''Exxon Valdez''" . . "A major oil spill" . "Exxon-Valdez-Oil Spill Crisis" . "''Exxon Valdez'' incident" . "Exxon Valdez disaster" . . "spilling its cargo" . . . "The Exxon Valdez Oil Spill" . . . . "Exxon" . . "Exxon Valdez oil spill" . . "oil spill" . . "spilled oil" . . "second largest oil spill" . . . . "Exxon Valdez tanker spill" . "Exxon Valdez oil spill" . . "Exxon ''Valdez''" . "extensive contamination" . . . "''Exxon Valdez'' disaster" . "1989 Exxon Valdez oil spill" . . "The oil tanker Exxon Valdez spills" . "spilling" . . . . . "Exxon Valdez grounding" . "''Exxon Valdez'' oil spill" . . . . . . . . "Exxon Valdez" . . "spill" . "Exxon Valdez oil spill of 1989" . "''Exxon Valdex'' oil spill" . "Exxon's 1989 ''Valdez'' oil spill" . "Exxon ''Valdez'' oil spill" . "Exxon Valdez Oil Spill" . . . . "''Exxon Valdez'' in 1989" . "1989 oil spill" . "'' Exxon Valdez'' oil spill" . "Valdez oil spill" . "''Exxon Valdez'' spilled" . . "ran aground" .