| 11. | The revolution in US shale oil and gas is greatly lowering energy costs.
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| 12. | In Germany shale oil extraction started at the Dotternhausen cement factory in 1940.
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| 13. | The shale oil contains bound sulfur, which exerts its effect in shale oil.
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| 14. | In 1991, New PARAHO reported successful tests of SOMAT shale oil asphalt additive.
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| 15. | The plan was to produce shale oil by underground mining and surface retorting.
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| 16. | It yields of shale oil per one ton of oil shale.
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| 17. | The table below reports reserves by estimated amount of shale oil.
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| 18. | Condensed shale oil and gases are removed from the retort at the bottom.
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| 19. | Many of them built retorts to extract the shale oil.
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| 20. | Such industrial-scale retorts are used in shale oil extraction and the production of charcoal.
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