000
00290pam a2200109a 44500
082
_a
TR
_b
IC-9305
100
_a
Gregory J. Chekan
245
1
_a
Analysis and designe conciderations for superimposed longwall gate roads
260
_a
_b
_c
700
_a
Jeffrey M. Listak
997
_a
TR6508 C
999
_c
405735
_d
405735