000 00300nam a2200121Ia 4500
008 190711s9999 xx 000 0 und d
082 _a622.25 A364
100 _aALDORF,J
245 0 _aMINE OPENINGS:STABILITY AND SUPPORT
260 _aMSTERDAM
_bElsevier
_c1986
300 _a25X17
942 _cBK
_2DDC
999 _c20504
_d20504