TY  - BOOK
AU  - Lewis,Robert Strong
AU  - Clark,George Bromley
TI  - Elements of mining
SN  -  (pbk.)
AV  - TN145 .L68 1964
U1  - 622 
PY  - 1964///
CY  - New York
PB  - J. Wiley
KW  - Mining engineering
N1  - Includes bibliographies
ER  -