Ramseur, Jonathan L.; Lattanzio, Richard K.; Luther, Linda; Parfomak, Paul W. & Carter, Nicole T. Oil Sands and the Keystone XL Pipeline: Background and Selected Environmental Issues. Washington D.C.. UNT Digital Library. http://digital.library.unt.edu/ark:/67531/metadc98034/. Accessed December 21, 2013.
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