රුක් රෝපනය 
 Ruk ropana 

 -  Central environmental authority  1991 
 - 22p., ill.,  27 cm 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Tree
<br/><br/><label>Universal Decimal Class. No.: </label>581.52 Sri lan  / ava