| 11. | By 1921, it became evident that the mine fire had persisted and spread.
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| 12. | Two years ago, 35 of his colleagues were killed in a mine fire.
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| 13. | The mine fire is to underground and burns at a temperature of around.
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| 14. | Byrnesville was one of the casualties of the Centralia mine fire.
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| 15. | There are, however, irregular snowmelts in the area, which is typical of mine fires.
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| 16. | The coal they mined fired the factories that help make the Soviet Union a superpower.
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| 17. | On April 23, 1966, a plan to control the mine fire was put into action.
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| 18. | On July 7, 35 coal workers were killed in a mine fire in Donetsk region.
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| 19. | It also occurs as a result of mine fires.
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| 20. | A relief train was sent up from Pennsylvania with rescue personnel experienced in coal-mine fires.
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