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2. Standard Practice for Proximate Analysis of Coal and Coke;American Society for Testing and Materials (ASTM),2013
3. Standard Test Method for Gross Calorific Value of Coal and Coke;American Society for Testing and Materials (ASTM),2013
4. Standard Practice for Determination of Gas Content of Coal — Direct Desorption Method;American Society for Testing and Materials (ASTM),2015
5. Standard Classification of Coals by Rank;American Society for Testing and Materials (ASTM),2015