SOCIETY FOR MINING, METALLURGY & EXPLORATION <br/><br/>
RAPID EXCAVATION AND TUNNELING CONFERENCE PROCEEDINGS (BOSTON) 

 - Colorado  SME  1993 
 - 23X16 
<br/><br/><label>ISBN: </label>0873351274 
<br/><br/><label>Dewey Class. No.: </label>622.2606 S678