Associated Press
This photo from July 31, 2012 shows a beached air boat as bathers walk in the nearly dry Platte River near Yutan, Neb., Tuesday, July 31, 2012.  The latest U.S. Drought Monitor survey shows an increase in extreme drought conditions in four Plains states but a slight decrease in the overall area of the lower 48 states experiencing some form of drought. (AP Photo/Nati Harnik)

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