Standard classification of coals by rank. ASTM standard ...
article{osti_362131, title = {Standard classification of coals by rank. ASTM standard}, author = {}, abstractNote = {This classification is under the jurisdiction of ASTM Committee D5 on Coal and Coke and is the direct responsibility of Subcommittee on Classification of Coals. The current edition was approved Apr. 10, 1998. It was published June 1998.