In this July 9, 2009 file photo three combines harvest the winter wheat on the Cooksey farm near Roggen, Colo.
In this July 9, 2009 file photo three combines harvest the winter wheat on the Cooksey farm near Roggen, Colo. AP File photo
In this July 9, 2009 file photo three combines harvest the winter wheat on the Cooksey farm near Roggen, Colo. AP File photo