The "International Classification of Hard coals by type", published by the United Nations in 1956, consists of primary classification by volatile matter content up to 33% volatile matter (dry ash free) and by calorific value (moist ash free) for coals with higher volatile matter contents.
Reference:
Savage, W.H.D. & Savage, W. 1957. The classification of South African coals according to international classification of hard coals by type. http://hdl.handle.net/10204/12927 .
Savage, W. H. D., & Savage, W. (1957). The classification of South African coals according to international classification of hard coals by type Retrieved from http://hdl.handle.net/10204/12927
Savage, W.H.D, and WHD Savage The classification of South African coals according to international classification of hard coals by type. 1957. http://hdl.handle.net/10204/12927
Savage WHD, Savage W. The classification of South African coals according to international classification of hard coals by type. 1957 [cited yyyy month dd]. Available from: http://hdl.handle.net/10204/12927
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