000 00304nam a2200121Ia 4500
001 122909
008 170722s9999 xx 000 0 und d
100 _aObert, Leonard
245 _aRock mechanics aznd the design of structures in rock /
260 _c1967.
700 _aDuvall , Wilburt
942 _cGEN
999 _c86282
_d86282