00341nam a22001097a 4500008004100000040005500041080002300096245002300119260006600142300000900208650001400217230619b        |||||||| |||| 00| 0 eng d  aNational Science LibrarycNational Science Library  a622.7:622.33b[M7]  aResearch monograph  aDhanbad: bDepartment of Fuel and Mineral Engineering, c1986  a43p.  aMonograph