TY  - BOOK
AU  - Hoover,Herbert
TI  - Principles of mining: Valuation, organization and administration, cooper, gold, lead, silver, tin and zinc
AV  - TN145 H63
PY  - 1909///
CY  - New York
PB  - Hill
KW  - Minas y riquezas minerales
KW  - Industria minera
ER  -