Young, George J. <br/><br/>
Elements of mining. 

 - 4th ed. 
 - New York :  McGraw-Hill,  1946. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Explotacion a cielo abierto
<br/><br/><label>Index Terms--Genre/Form: </label><br/>Libro
<br/><br/><label>Universal Decimal Class. No.: </label>622.27