WIGHTMAN,W.D <br/><br/>
RAPID EXCAVATION AND TUNNELLING CONFERENCE PROCEEDINGS(WASHINGTON) 

 - LITTLETON  SMME  1991 
 - 24X16 
<br/><br/><label>ISBN: </label>0873351010 
<br/><br/><label>Dewey Class. No.: </label>622.2606 W658