FILE - In this July 26, 2012 file photo, a field of dried corn plants is seen near Percival, Iowa. In its weekly map, The U.S. Drought Monitor released Thursday, Aug. 23, 2012, showed that as of Tuesday, just over two-thirds of Iowa, the nation's biggest corn producer, was in extreme or exceptional drought _ the worst two classifications. That's up more than 5 percentage points, to 67.5 percent, from the previous week. (AP Photo/Nati Harnik, File)
Read the article: Drought worsens in Plains, despite cooler temps
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