Indian coals quality evaluation data / Central Fuel Research Institute, Vol. 6, Chirimiri, Sohagpur, Johilla River, Umaria, Pench-Kanhan-Tawa Velley & Mohpani Coalfields - Bihar: Central Fuel Research Institute, 1979 - xvii, 406p. Subjects--Topical Terms: Coals Subjects--Index Terms: Evaluation data Universal Decimal Class. No.: 552.574(540) / L9.6