| 21. | This is much like the subsidence associated with old coal mines.
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| 22. | In May, an explosion at another coal mine killed 10 miners.
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| 23. | An underground coal mine right across the street from the plant.
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| 24. | Sumitomo Coal Mining rose as much as 30 yen to 550.
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| 25. | Hednesford was an important coal mining community for over a century.
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| 26. | The Leyden Coal Mine was operated by the Leyden Coal Company.
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| 27. | The country has several coal mines but need to be modernized.
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| 28. | The line was unique in using native coal mined at Arigna.
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| 29. | First the steel mill closed, then the coal mines cut back.
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| 30. | By 1896 John Fletcher had coal mines at Deane and Doffcocker.
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