Allen, Gwen <br/><br/>
Freshwater animals  / 
by Gwen Allen, Joan Denslow; illustrations by Derek Whiteley 
 - London :  Oxford University Press ,  1970 
 - 61 p. :  ill . ;  21 cm . 
 - The clue books .
<br/><br/>Includes index 
<br/><br/><label>ISBN: </label>0199180075 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Fresh--water fauna--Juvenile literature