World Health Organization & SEARO Regional Health Papers No.4 <br/><br/>
Low-cost water supply and sanitation technology  pollution and health problems 

 - World Health Organization, New Delhi  1984 
 - v,40 
<br/><br/><label>ISBN: </label>92 9022 173 9 
<br/><br/><label>Dewey Class. No.: </label>614.772 W.H.O./SEARO