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- toc50639 accessdate "2014-09-06".
- toc50639 isCitedBy History_of_the_oil_shale_industry.
- toc50639 isCitedBy History_of_the_oil_shale_industry_in_the_United_States.
- toc50639 journal "Kansas Geological Survey Bulletin".
- toc50639 publisher Encyclopædia_Britannica.
- toc50639 title "Oil shale: History of oil shale use".
- toc50639 url toc50639.