Proceedings 

 - London :  Institution of Water Engineers and Scientist,  (1979) 
 - 85 p.  : ilus. 
<br/><br/><label>LCCN: </label>57354 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Agua--Purificacion.
<br/><br/><label>Dewey Class. No.: </label>628.16  / S9