TY  - BOOK
AU  - Spurr,Josiah Edward
AU  - Wormser,Felix Edgar
TI  - The marketing of metals and minerals: a series o articles by specialists 
AV  - HD9506.E8 M35
PY  - 1925///
CY  - New York
PB  - McGraw-Hill
KW  - Industria metalmecánica
KW  - Estados Unidos
KW  - Industria minera
ER  -