In this Sept. 6, 2012 file photo, a combine is surrounded by dust at it finishes harvesting a row of corn near Bennington, Neb. The latest update on the worst U.S. drought in decades shows that farmers bringing in their weakened corn crops had some relief with recent rains that soaked much of middle America. The weekly U.S. Drought Monitor map released Thursday, Sept. 13, 2012 shows two-thirds of Iowa now in extreme or exceptional drought, the two worst categories. (AP Photo/Nati Harnik)

Associated Press
In this Sept. 6, 2012 file photo, a combine is surrounded by dust at it finishes harvesting a row of corn near Bennington, Neb. The latest update on the worst U.S. drought in decades shows that farmers bringing in their weakened corn crops had some relief with recent rains that soaked much of middle America. The weekly U.S. Drought Monitor map released Thursday, Sept. 13, 2012 shows two-thirds of Iowa now in extreme or exceptional drought, the two worst categories. (AP Photo/Nati Harnik)
In this Sept. 6, 2012 file photo, a combine is surrounded by dust at it finishes harvesting a row of corn near Bennington, Neb. The latest update on the worst U.S. drought in decades shows that farmers bringing in their weakened corn crops had some relief with recent rains that soaked much of middle America. The weekly U.S. Drought Monitor map released Thursday, Sept. 13, 2012 shows two-thirds of Iowa now in extreme or exceptional drought, the two worst categories. (AP Photo/Nati Harnik)
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