TY  - BOOK
AU  - Preston Lee E
TI  - Exploration for non-ferrous metals:  An economic an   
U1  - X9(F1).73.N6, K0 
PY  - 1960///
KW  - Technological Industry
N1  - Resources for the future (Washington ed by Henery Jarrett and Vera W Dodds)
ER  -