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The top documents tagged [upgraded crude oil]
Kalina Scherbel December 4, 2003 North American Tar Baby: Draining the Alberta Oil Sands
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FOSSIL FUELS IV
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FOSSIL FUELS IV Tar Sand and Oil Shale. Tar (oil) Sand Tar sands are simply sands that contains a hydro carbon product called butumen. Tar sands are simply
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