Rapid excavation and tunneling conference, Los Angeles, California, 1989 :  proceedings / 
editors, Robert A.Pond, Patric B. Kenny. 
 - New York :  Society of Mining Engineers,  1989. 
 - xii, 881p :  ill. 
<br/><br/><label>LCCN: </label>92023122 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Tunneling--Congresses.<br/>Excavation--Congresses.<br/>Underground construction--Congresses.
<br/><br/><label>Dewey Class. No.: </label>624  / .19