TY  - BOOK
AU  - SEMINAR OF ECONOMICS
TI  - ENGINEERING MINERAL OF ECONOMIC
T2  - 0
U1  - 622.073 
PY  - 1976///
CY  - LONDON-U.S.A.
PB  - MINING JOURNAL BOOKS LTD.
KW  - CIENCIAS APLICADAS
N1  - ENGINERRING-ECONOMICS
ER  -