000
00252pam a2200109a 44500
082
_a
TR
_b
RI-9220
100
_a
Thomas M. Barczak
245
1
_a
Two-leg longwall shield mechanics
260
_a
_b
_c
700
_a
David E. Schwemmer
997
_a
TR6595 C
999
_c
405761
_d
405761