000
00259pam a2200097a 44500
082
_a
TR
_b
IC-7568
100
_a
S. P. Polack
245
1
_a
Methods of excavation and roof support used in some recently constructed tunnels
260
_a
_b
_c
997
_a
TR5226 C
999
_c
405401
_d
405401