1. Clarkson CR, Bustin RM (1997) Variation in permeability with lithotype and maceral composition of Cretaceous coals of the Canadian Cordillera. Int J Coal Geol 33:135–151
2. Close J, Mavor M (1991) Influence of coal composition and rank on fracture development in Fruitland coal gas reservoirs of the San Juan Basin. In: Schwochow SD (ed) Coal bed methane of Western North America. Rocky Mountain Association of Geologists Field Conference Guidebook, Colorado, pp 109–121
3. Daniels EJ, Altaner SP (1990) Clay mineral authigenesis in coal and shale from the anthracite region, Pennsylvenia. Am Mineral 75:825–839
4. Datta DR (2005) Cleat system and its significance in the light of coal bed methane. Scientific Communication. News Coal Wing Geol Surv Ind 25(1):28–31
5. Gamson PD, Beamish BB, Johnson DP (1993) Coal microstructure and micro permeability and their effects on natural gas recovery. Fuel 72:87–99