TY  - GEN
AU  - Stefanko,Robert
TI  - Coal mining technology: theory and practice 
SN  - 0895204045
PY  - 1983///
CY  - New York
PB  - Society of Mining Engineers of the American Institute of Mining, Metallurgical, and Petroleum Engineers
KW  - Coal mines and mining
KW  - Mining engineering
ER  -