Padmasiri, J.P <br/><br/>
ජලය පිරිපහදු කිරිම 
 Jalaya piripahadu kirima 

 -  National water supply drainage board  2005 
 - 20p., ill.,  22 cm 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Water refinery <br/>Water management
<br/><br/><label>Universal Decimal Class. No.: </label>663.634  / JAL