Mann, Kenneth Henry,  1923- <br/><br/>
A key to the British freshwater leeches :  with notes on their eco logy / 
Kenneth Mann. With a coloured plate by E. V. Watson. 
 - Ambleside :  Westmorland Freshwater Biological Association,  195 4. 
 - 21 p. :  ill. ;  22 cm. 
 - Freshwater Biological Association. Scientific publication ;  no.14 . .
<br/><br/>Includes bibliographical references. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Leeches<br/>Worms--Great Britain