Obert, Leonard <br/><br/>
Rock mechanics an the desing of structures in rock. 

 - New York :  J. Wiley,  1967. 
<br/><br/><label>ISBN: </label>0471652350 
<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