Warren, P.D. <br/><br/>
Block and topographical survey ,Vol II, Survey Dept. manual 

 - Colombo govement Printer  Colombo  1906 
 - 87p.  fig. 
<br/><br/><label>Nat. Bib. No.: </label>1851 
<br/><br/><label>Universal Decimal Class. No.: </label>528.41  / BLO