000 00290pam a2200109a 44500
082 _aTR
_bIC-9305
100 _aGregory J. Chekan
245 1 _aAnalysis and designe conciderations for superimposed longwall gate roads
260 _a
_b
_c
700 _aJeffrey M. Listak
997 _aTR6508 C
999 _c405735
_d405735