<p>Miles of pipe ready to become part of the Keystone Pipeline are stacked in a field near Ripley, Okla., on Feb. 1, 2012. </p>
January 11, 2015
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January 11, 2015 8 p.m.
<p>Miles of pipe ready to become part of the Keystone Pipeline are stacked in a field near Ripley, Okla., on Feb. 1, 2012. </p>
January 11, 2015