000
00238pam a2200097a 44500
082
_a
TR
_b
RI-9238
100
_a
Tobias W. Goodman
245
1
_a
Rotary drilling techniques used in the beckley coalbed
260
_a
_b
_c
997
_a
TR6611 C
999
_c
405776
_d
405776