TY  - BOOK
AU  - Vorobjev, B. M. 
AU  - Deshmukh, R. T. 
TI  - Advanced coal mining
U1  - 622.335 VOR D.2 
PY  - 1966///.
CY  - Bombay : 
PB  - Asia Publishing House, 
KW  - Coal mines and mining
N1  - Includes index.
ER  -