000 00287pam a2200097a 44500
082 _aTR
_bIC-9283
100 _aRobert H. Peters
245 1 _aStrategies for encouraging miners to stay away from unsupported roof and perform self-protective actions
260 _a
_b
_c
997 _aTR6489 C
999 _c405718
_d405718