PERKO,H.A. <br/><br/>
HELICAL PILES: PRACTICAL GUIDE TO DESIGN AND INSTALLATION 

 - New Jersey  Wiley  2009 
 - xvi+512p.,24x19Cms. 
<br/><br/><label>ISBN: </label>0470404799 
<br/><br/><label>Dewey Class. No.: </label>624.154 P451