World Health Organization. <br/><br/>
Water supply and sanitation sector monitoring report 1993 

 - Ginebra :   World Health organization,   1993. 
 - 57p. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>ABASTECIMIENTO DE AGUA<br/>INGENIERIA SANITARIA
<br/><br/><label>Universal Decimal Class. No.: </label>628.1