1. Annual Book of ASTM Standards, Section 5, Petroleum Products, Lubricants and Fossil Fuels,1991
2. Sedimentology, sequence stratigraphy, palynology, organic petrology and geochemistry of Mannville coals in South-Central Alberta;Banerjee;Geological Survey of Canada, Bulletin,2002
3. Boron in illite as an indicator of paleosalinity in Illinois coals;Bohor;Journal of Sedimentary Petrology,1973
4. U.S. Geological Survey Coal Quality (COALQUAL) Database: Version 2.0. U. S. Geological Survey Open-File Report;Bragg,1997
5. Determination of 25 elements in coal ash from 8 Argonne Premium Coal samples by inductively coupled argon plasma-mass spectrometry;Briggs,1997