Hoover, Herbert C. <br/><br/>
Principles of mining :  valuation, organization and administration. 

 - New York :  McGraw-Hill,  1909. 
 - 199 p. :  il. ;  21 cm 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Minería
<br/><br/><label>Index Terms--Genre/Form: </label><br/>Libro
<br/><br/><label>Universal Decimal Class. No.: </label>622