In this Feb. 1, 2012, file photo, miles of pipe ready to become part of the Keystone Pipeline are stacked in a field near Ripley, Okla. (AP Photo/Sue Ogrocki, File)
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In this Feb. 1, 2012, file photo, miles of pipe ready to become part of the Keystone Pipeline are stacked in a field near Ripley, Okla. (AP Photo/Sue Ogrocki, File)
