Tunnelling under difficult conditions 
/ Proceedings of the International Tunnel Symposium, Tokyo, 1978 
 - Oxford:   Pergamon Press, ,   1979 
 - xv, 406p.  
<br/><br/><label>ISBN: </label>9780080242378 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Science 
<br/><br/><label>Subjects--Index Terms: </label>Tunnelling  
<br/><br/><label>Universal Decimal Class. No.: </label>624.19(082.2)  / L9