Mellanby, Helen. <br/><br/>
Animal life in fresh water :  a guide to fresh-water invertebrates / 
with a foreword by L.E.S. Eastham. 
 - [6th ed., rev. and reset]. 
 - London :  Chapman and Hall,  [1971, c1963] 
<br/><br/> "First published in 1938."  First published in this ed. 1963. 
<br/><br/>Includes bibliographical references. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Freshwater animals -- Great Britain.--Freshwater animals -- Great Britain.<br/>Invertebrates.