Appropriate technology for water supply and sanitation 
/ World Bank 
 - Washington D C:      World Bank,                  1981 
 - 318p. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Language
<br/><br/><label>Subjects--Index Terms: </label>Water 
<br/><br/><label>Universal Decimal Class. No.: </label>R 628.1/.4  / M1