Wheal, Caroline. <br/><br/>
Freshwater pollution / 
text by Caroline Wheal. 
 - Nairobi :  UNEP,  1991. 
 - 36 p. :  ill. ;  26 cm. 
 - UNEP/GEMS environment library ;  6 .
 - Global freshwater quality. .
<br/><br/>Includes bibliographical references. 
<br/><br/> Open access. 
<br/><br/><label>LCCN: </label>92981260  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Water--Pollution.<br/>Water-supply.