000 00329nam a2200121Ia 4500
008 190711s9999 xx 000 0 und d
082 _a622.33 S7994
100 _aSTEFANKO,B
245 0 _aCOAL MINING TECHNOLOGY THEORY AND PRACTICE
260 _aNEW YORK
_bSOCIETY OF MINING ENGINEERS
_c1983
300 _a28X23
942 _cBK
_2DDC
999 _c22077
_d22077