| 41. | Since 1965, oil shale usage in Fushun started to decline.
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| 42. | It was as the first private oil shale mining company.
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| 43. | Davis said the county is ready if oil shale again returns to the forefront.
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| 44. | The sudden disappearance of oil shale is one sign of massive loss of life.
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| 45. | American petroleum refining largely grew out of oil shale refining.
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| 46. | Parachute Trustee Dave Beasely, a local businessman, has been through three oil shale boom-and-busts.
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| 47. | Hutton's classification describes it as a marine source oil shale.
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| 48. | Oil shale is dead, as long as you or I or our children are concerned,
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| 49. | The rock covers a vast network of oil shale.
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| 50. | Israel has deposits of oil shale in the area.
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