TY  - BOOK
AU  - Wahl, Siegfried von.
TI  - Investment appraisal and economic evaluation of mining enterprise / 
SN  - 0-87849-048-5
U1  - HX:(X65) 
PY  - 1979///
CY  - Clausthal-Zellerfeld : 
PB  - Trans Tech Publications , 
KW  - Earth Science
ER  -