Guidelines for drinkin-water quality / 
World health organization 
 - 3 volúmenes 
<br/><br/>Contenido: v.1. recommendations 
<br/><br/><label>ISBN: </label>9241541687  (v.1) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Agua potable--Normas--Manuales
<br/><br/><label>LC Class. No.: </label>TD215  / O74