TY  - BOOK
AU  - Das, Pradip Kumar  .
TI  - Petroeum and coal / 
SN  - 81-7533-042-2
U1  - F:551:555 
PY  - 1997///
CY  - New Delhi : 
PB  - M.D. Publications Pvt. Ltd. , 
KW  - Technology- Natural gas
ER  -