TY  - BOOK
T1  - Geologic investigation of roof and floor strata :Longwall demonstration, Old Ben Mine no. 24 : final technical report, no. 1 /
DA  - 1982.
CY  - Champaign, Ill. :
AU  - Bauer, Robert A.,
VL  - 1982-2
CN  - QE105.A36
CN  - QE105.A36
PB  - Illinois State Geological Survey,
PP  - Champaign, Ill. :
PY  - 1982.
ID  - 52649
KW  - Coal mines and mining
KW  - Coal balls
KW  - Geology
KW  - Coal
TI  - Geologic investigation of roof and floor strata :Longwall demonstration, Old Ben Mine no. 24 : final technical report, no. 1 /
ER  -