1. Morphometry;Aherne,1982
2. Collection of a gross sample of coal;ASTM D2234-76,1976
3. Microscopical determination of volume percent of physical components in a polished specimen of coal;ASTM D2799,1980
4. Preparing coal samples for microscopical analysis by reflected light;ASTM D2797,1980
5. Petrographic analysis of bituminous coal and anthracite, Part 3: Method of determining maceral group composition of bituminous coal and anthracite;British Standard (BS) 6127,1982