Szechy, Karoly <br/><br/>
Art of tunnelling 
Karoly Szechy 
 - Budapest :  Akademia Kiado,  1966. 
 - 891p. :  ill. ;  25 cm. 
<br/><br/>Includes bibliographical references 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Tunneling
<br/><br/><label>LC Class. No.: </label>TA805.S913