Beard, James T <br/><br/>
Mine examination, questions and answers. 

 - 1st ed. 
 - New York :  McGraw-Hill,  1923. 
 - 3 v. :  il. ;  20 cm 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Minas<br/>Minería
<br/><br/><label>Index Terms--Genre/Form: </label><br/>Libro
<br/><br/><label>Universal Decimal Class. No.: </label>622.8