Newton, Lesley <br/><br/>
Down the drain  the science of cleaning water 

 - London  Simon & Schuster  1990 
 - 63 p.  ill. 
<br/><br/><label>ISBN: </label>0750002743 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Water purification
<br/><br/><label>Dewey Class. No.: </label>628.162  / N28