Subasinghe, S.A.P. <br/><br/>
Scale calculation 

 - Irrigation department  Colombo 07 
 - 31p.  fig. 
<br/><br/><label>Nat. Bib. No.: </label>688 
<br/><br/><label>Subjects--Index Terms: </label>Map; Scale; Formula 
<br/><br/><label>Universal Decimal Class. No.: </label>528.923  / SCA