Water supply and sanitation sector project design manual D3 

 - Colombo  National Water Supply and Drainage Board  1989 
 - 182 p. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>PUBLIC HEALTH AND ENVIRONMENTAL ENGINEERING
<br/><br/><label>Universal Decimal Class. No.: </label>628.1(548.7)  / WAT