UNECE » Sustainable Energy» Areas of Work » Coal Mine Methane » Publications » Coal» 1988 » International Codification System for Medium and High Rank Coals » International Codification System for Medium and High Rank Coals
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Published:January 1988
Sales Number: E.88.II.E.15 ISBN: 92-1-116420-6
Read more & download:
http://www.unece.org/energy/se/coal/code.html
