oil shale sentence - oil shale sentence in Hindi (31-40)

	31.	In the 1970s he worked on the recovery of petroleum from oil shale.
	32.	In 1939, the company produced 126, 238 tonnes of oil shale.
	33.	Oil shale retorting followed in 1881 by utilization of " D " retorts.
	34.	Cheap petroleum prices had driven oil shale out of business.
	35.	It was a developer of the Stuart Oil Shale Project.
	36.	It is the world's biggest oil shale to energy company.
	37.	And the naval petroleum and oil shale reserves would be reduced by 19 percent.
	38.	The main business includes coal mining and oil shale processing.
	39.	Marble quarries, semiprecious stones, and oil shales were all exploited.
	40.	It consists primarily of laminated oil shale, claystone, and siltstone.

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oil shale in a sentence