TY  - BOOK
T1  - Longwall retreat of gate road pillars
DA  - 1993.
CY  - Washington, D.C. (810 7th St., N.W., Washington 20241-0001) :
AU  - Listak, Jeffrey M.
AU  - Bauer, Eric R.
VL  - 9444
CN  - I 28.23:
CN  - TN23
CN  - TN288
PB  - U.S. Dept. of the Interior, Bureau of Mines,
PP  - Washington, D.C. (810 7th St., N.W., Washington 20241-0001) :
PY  - 1993.
N1  - Distributed to depository libraries in microfiche.
N1  - Shipping list no.: 93-0417-M.
ID  - 184676
KW  - Ground control (Mining)
KW  - Pillaring (Mining)
KW  - Longwall mining
TI  - Longwall retreat of gate road pillars
ER  -