FILE - This Oct. 4, 2012 file photo shows un-harvested corn in a field near Council Bluffs, Iowa. Corn growers had high hopes going into the 2012 planting season but the drought that began last spring hit the corn crop hard. As a result, corn prices skyrocketed and corn has become scarce in some regions, forcing 20 ethanol plants around the country to halt production. Most are not expected to resume production until after 2013 corn is harvested in late August or September. (AP Photo/Nati Harnik, File)
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