Flooded crops in Vicksburg, Miss., are pictured Tuesday, May 17, 2011. The Coast Guard said it closed the Mississippi River at the port in Natchez, Miss., on Tuesday because barge traffic could increase pressure on the levees. Heavy flooding from Mississippi tributaries has displaced more than 4,000 in the state, about half of them upstream from Natchez in the Vicksburg area. (AP Photo/Dave Martin)
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