Difference between revisions of "Rank of coal"
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Latest revision as of 17:53, 16 February 2006
목재에서 아탄, 갈탄, 역청탄, 무연탄으로 석탄화하는 과정의 정도를 말한다.
- This page was last edited on 16 February 2006, at 17:53.
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