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http://www.womp-int.com/story/2008vol5/story024.htm
http://oilsandstruth.org/changes-tarpit-mining-procedure
http://ourworld.unu.edu/en/canadas-oil-sands/
http://videosift.com/video/A-Truly-Colossal-Piece-of-Equipment-Bucket-Wheel-Excavator
http://cleantechnica.com/2009/03/04/dirtytechnica-the-most-destructive-machine-on-the-planet/