Greenhalgh, Malcolm. <br/><br/>
Freshwater life :  Britain and Northern Europe / 
Malcolm Greenhalgh, Denys Ovenden. 
 - 256 p. :  col. ill;  19 cm London :  Collins,  2007 
 - Collins pocket guide. .
<br/><br/>Includes bibliographical references (p. 247-248) and index. 
<br/><br/><label>ISBN: </label>9780007177776 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Freshwater animals--Europe, Northern--Identification.<br/>Freshwater animals--Great Britain--Identification.<br/>Freshwater plants--Europe, Northern--Identification.<br/>Freshwater plants--Great Britain--Identification.