In this Dec. 18, 2012 photograph scale examples of the various types of river vessel used on the Mississippi River, are on display at the Lower Mississippi River Museum in Vicksburg, Miss. The museum provides visitors with a extensive look at life surrounding the Mississippi River through several centuries by way of its interactive and static displays. Visitors also have the opportunity to tour the Motor Vessel Mississippi IV exhibit and see how crews worked and lived on the towboats used by the U.S. Army Corps of Engineers. (AP Photo/Rogelio V. Solis)

Associated Press
In this Dec. 18, 2012 photograph scale examples of the various types of river vessel used on the Mississippi River, are on display at the Lower Mississippi River Museum in Vicksburg, Miss. The museum provides visitors with a extensive look at life surrounding the Mississippi River through several centuries by way of its interactive and static displays. Visitors also have the opportunity to tour the Motor Vessel Mississippi IV exhibit and see how crews worked and lived on the towboats used by the U.S. Army Corps of Engineers.  (AP Photo/Rogelio V. Solis)
In this Dec. 18, 2012 photograph scale examples of the various types of river vessel used on the Mississippi River, are on display at the Lower Mississippi River Museum in Vicksburg, Miss. The museum provides visitors with a extensive look at life surrounding the Mississippi River through several centuries by way of its interactive and static displays. Visitors also have the opportunity to tour the Motor Vessel Mississippi IV exhibit and see how crews worked and lived on the towboats used by the U.S. Army Corps of Engineers. (AP Photo/Rogelio V. Solis)
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