TY  - BOOK
AU  - Wali Mohan K Ed.
TI  - Ecology and coal resource development
SN  - 0080238637
U1  - X9(HZ551):77.1.N7, L9.1-.2 
PY  - 1979///
CY  - New York
PB  - Pergamon press USA       
KW  - Minings
ER  -