1. Standard method for microscopical determination of the reflectance of the organic components in a polished specimen of coal;ASTM,1980
2. Standard definitions of terms relating to megascopic description of coal and coal beds and microscopical description and analysis of coal;ASTM,1980
3. Megascopic description of coal with particular reference to seams in southern Illinois;Cameron,1978
4. Recommended procedures and techniques for the petrographic description of bituminous coal;Chao;Int. J. Coal Geol.,1982
5. Petrographic Modal Analysis;Chayes,1956