Freshwater pollution. 

 - Nairobi :  The UNEP/GEMS Environment Library,  1991. 
 - 36 p. :  ill. ;  26 cm. 
 - UNEP/GEMS Environment Library ;  no. 6 .
<br/><br/> United Nations Environment Programme 
<br/><br/>Includes bibliographical references 
<br/><br/><label>ISBN: </label>9211005787 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Air--Pollution.
<br/><br/><label>Dewey Class. No.: </label>551.5