Difference between revisions of "Soft coal"
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Latest revision as of 17:34, 13 February 2006
무연탄중에서 질이 부드러운 휘탄을 가르킨ㄷ.
역천탄이나 갈탄도 때로는 포함이 된다.
- This page was last edited on 13 February 2006, at 17:34.
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