Thomas  <br/><br/>
Sprayed concrete lined tunnels  
/ Alun Thomas. 
 - London  2009 
 - xxii, 241p.  ill.  23cm 
<br/><br/><label>ISBN: </label>9780415368643  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Tunnel lining
<br/><br/><label>Dewey Class. No.: </label>624.193 THO 2009