Szechy, Károly <br/><br/>
The art of tunnelling. 

 - 2nd ed.  
 - Budapest :  Akadémiaikiado,  1973. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Tuneles
<br/><br/><label>Index Terms--Genre/Form: </label><br/>Libro
<br/><br/><label>Universal Decimal Class. No.: </label>624.19