TY  - BOOK
ED  - Organising committee of the 21st world mining congress                                                                                                                                                                                                         . 
TI  - World mining congress minier mondial congresso mundial de mineria / 
U1  - 028.74622 
PY  - 1984///
CY  - Calcutta : 
PB  - Organ9ising committee  , 
ER  -