<p>In this April 4, 1989 file photo, a sea otter swims in Valdez harbor in Prince William Sound, Alaska.</p>
March 21, 2014
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March 21, 2014 9 p.m.
Exxon Valdezoil spill lingers 25 years later
ANCHORAGE, Alaska - Before the Deepwater Horizon oil spill in 2010 in the Gulf of Mexico, there was the Exxon Valdez disaster in Alaska, at the time the nation's largest oil spill.