Hoover, Herbert,  1874-1964, <br/><br/>
Principles of mining :  Valuation, organization and administration, cooper, gold, lead, silver, tin and zinc. 

<br/><br/><label>Subjects--Topical Terms: </label><br/>Minas y riquezas minerales<br/>Industria minera
<br/><br/><label>LC Class. No.: </label>TN145  / H63