New Mining methods and shortcuts. 

 - New York :  Eng.and Min.Jour.,  [s.f.]. 
 - 160 p. :  il. ;  28 cm 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Minería<br/>Explotación minera
<br/><br/><label>Index Terms--Genre/Form: </label><br/>Libro
<br/><br/><label>Universal Decimal Class. No.: </label>622.2