Hazards in tunneling and on falsework  proceedings of the third conference,held at the institution of civil engineers,London,on 19-20 March 1975 

 -  1975 
<br/><br/><label>Subjects--Uniform Titles: </label><br/>Tunnels
<br/><br/><label>Dewey Class. No.: </label>624.19  / I5H