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 |