Associated Press
In this April 29, 2012 photo, passengers on the American Queen steamboat watch as the vessel enters a river lock on the Ohio River near Brookport, Ill. The American Queen is the largest steamboat in the world, carrying 436 passengers. The 418-foot-long vessel is taking tourists on long-distance trips on the Mississippi for the first time since 2008, when its previous owner ceased operations.  (AP Photo/Adrian Sainz)

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