In this Oct. 5, 2013, file photo, the Grand Canyon National Park is covered in the morning sunlight as seen from a helicopter near Tusayan, Ariz. (AP Photo/Julie Jacobson, File)
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In this Oct. 5, 2013, file photo, the Grand Canyon National Park is covered in the morning sunlight as seen from a helicopter near Tusayan, Ariz. (AP Photo/Julie Jacobson, File)
