TY  - BOOK
AU  - Havtman H.L.
TI  - Introductory Mining Engineering
SN  - 0000019830
U1  - 622 
PY  - 1987///
CY  - New york
PB  - John Wiley & Sons ,New York
KW  - Engineering  Introductory  Mining
KW  - Mining and related operations(622)
ER  -