TY  - BOOK
AU  -  ,  .
TI  - Optimal exploitation of soild mineral resources challenges and constraints:The 12th congress of world mining congress:Technical sessions III&IV / 
U1  - HZp1,N84 
PY  - 1985///
CY  - Calcutta : 
PB  - The Institute Of Engineers (India) , 
KW  - Earth Science
ER  -