KS E ISO 7404-3-2013(2018) Methods for the petrographic analysis of bituminous coal and anthracite Part 3: Method of determining maceral group composition
2013KS E ISO 7404-3:2013 Methods for the petrographic analysis of bituminous coal and anthracite Part 3: Method of determining maceral group composition
2003KS E ISO 7404-3:2003 Methods for the petrographic analysis of bituminous coal and anthracite-Part 3 : Method of determining maceral group composition