1. Annual Book of ASTM Standards; Part 26, Gaseous Fuels; Coal and Coke;American Society for Testing and Materials (ASTM),1979
2. Tectonic controls on sand distribution in the Late Cretaceous-Tertiary coal basins of southern Sackatchewan;Broughton,1979
3. Kerogen studies and geological interpretations;Dow;J. Geochem. Explor.,1977
4. The petrology of Greek brown coals;Cameron;Int. J. Coal Geol.,1984
5. Organic petrology of Hat Creek coal deposit No. 1, British Columbia;Goodarzi;Int. J. Coal Geol.,1985