Hellawell, J.M. <br/><br/>
Biological Indicaors of Freshwater Pollution and Environmental Management 

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 - London  Elsevier Applied Science  1986 
 - xiii,546 p.   
<br/><br/>  Bibliog p. 452 -508 
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<br/><br/><label>Subjects--Index Terms: </label>Water Pollution and Environmental Management 
<br/><br/><label>Dewey Class. No.: </label>629.19