TY  - BOOK
T1  - Papers presented before the Symposium on Underground Mining :October 27-29, 1981, Kentucky Fair & Exposition Center, Louisville, Kentucky /
DA  - 1981.
CY  - New York :
CN  - TN816.S9 P34
CN  - TN816.S9
PB  - McGraw-Hill,
PP  - New York :
PY  - 1981.
N1  - Cover title: Underground coal mining symposium.
N1  - "Coal Conference and Expo VI."
ID  - 97416
KW  - Coal mines and mining
KW  - Coal
SN  - 076067815
TI  - Papers presented before the Symposium on Underground Mining :October 27-29, 1981, Kentucky Fair & Exposition Center, Louisville, Kentucky /
ER  -