00383nam a2200121Ia 4500008004100000040001700041082002500058110004300083245005400126260004100180300001400221650002600235190328s9999||||xx |||||||||||||| ||und||  aNITILcNITIL  221sta662.6206bI39R  aIndia. Ministry of Industry and Supply 0aReport of the working party for the coal industry  aDelhibManager of Publicationsc1951  aiv, 188p.  aCoal mines and mining