000
00267pam a2200097a 44500
082
_a
TR
_b
IC-7792
100
_a
S. J. Pearce
245
1
_a
Bureau of mines approval system for respiratory protective devices(revision of i.c.7600)
260
_a
_b
_c
997
_a
TR5383 C
999
_c
405470
_d
405470