000 | 00321pam a2200109a 44500 | ||
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082 |
_aTR _bRI-9403 |
||
100 | _aBauer E R | ||
245 | 1 | _aInfluence of subjacent gob on longwall development mining in the upper kittanning coalbed of south-central pennsylvania | |
260 |
_a _b _c |
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700 | _aSames G P | ||
997 | _aTR6782 C | ||
999 |
_c405936 _d405936 |