000 00277nam a22001217a 4500
999 _c1114
_d1114
020 _a8122409741
082 _a622.3301
100 _aR D Singh
245 _aPrinciples and practices of modern coal mining
260 _aNew Delhi
_bNew Age
_c2010
300 _a696
942 _cBK
_03