Global freshwater quality  a first assessment 
edited by Michel Meybeck, Deborah V. Chapman, Richard Helmer. 
 - Cambridge, Mass., U.S.A.  Published on behalf of the World Health Organization and the United Nations Environment Programme by Blackwell Reference  1990. 
 - x, 306 p. cm. 
<br/><br/> At head of title: Global Environment Monitoring System. 
<br/><br/><label>ISBN: </label>0631173145  90.00 
<br/><br/><label>LCCN: </label>89018289  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Water quality<br/>Water--Pollution.
<br/><br/><label>LC Class. No.: </label>TD370  / .G56 1990 
<br/><br/><label>Dewey Class. No.: </label>363.73/942