000
00288pam a2200109a 44500
082
_a
TR
_b
RI-8142
100
_a
Robert P. Vinson
245
1
_a
Three coal mine ventilation studies using sulfur hexaflusoride tracer gas
260
_a
_b
_c
700
_a
Fred N. Kissell
997
_a
TR2051 C
999
_c
404765
_d
404765