North american tunneling-2008 
/Michael F.Roach 
 - Littleton  Society for mining, metallurgy, and exploratin, Inc.  2008 
 - xii, 834 p. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Tunneling-North America
<br/><br/><label>Dewey Class. No.: </label>324.19  / PRO