WILLIAMSON, G.E. <br/><br/>
PROCEEDINGS: RAPID EXCAVATION AND TUNNELING: CONFERENCE SAN FRANCISCO, CALIFORNI 

 - METALLURGYLITTLETON  SOCIETY FOR MINING  1995 
 - 832p.,24x16cms. 
<br/><br/><label>ISBN: </label>0873351320 
<br/><br/><label>Dewey Class. No.: </label>622.2606 W729