000 00324nam a2200121Ia 4500
008 190711s9999 xx 000 0 und d
082 _a622.2 C559
100 _aCHUGH,Y.P
245 0 _aGROUND CONTROL IN ROOM-AND-PILLAR MINING
260 _aNEW YORK
_bSOCIETY OF MINING ENGINEERS
_c1982
300 _a28X22
942 _cBK
_2DDC
999 _c22079
_d22079