Drilling
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Revision as of 15:17, 28 January 2013 by Planner (talk | contribs) (Created page with "Petroleum requires to be extracted from the ground and processed into more valuable resources. A refinery can be built to convert petroleum into fuel and plastic.")
Petroleum requires to be extracted from the ground and processed into more valuable resources.
A refinery can be built to convert petroleum into fuel and plastic.
