Willoughby, L. G. <br/><br/>
Freshwater biology / 
L. G. Willoughby. 
 - London :  Hutchinson,  1976. 
 - 167 p. , [8] p. of plates :  ill. , maps ;  24 cm. 
 - Topics in the biological sciences. .
<br/><br/>Includes bibliographical references and index. 
<br/><br/><label>ISBN: </label>0091254302 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Freshwater biology.