ජල පෝෂක  ප්‍රදේශ සංරක්ෂණය 
 Protection of watersheds 

 -  Ministry of envrionment and natural resources 
 - 97p., ill.,  30 cm 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Watershed <br/>Forest <br/>Water <br/>Soil Erosion
<br/><br/><label>Universal Decimal Class. No.: </label>556.51  / JAL