Estuanne biology 
Barnes, R.S.K. 
 -  Camelot Press Ltd.  1974 
 - 76 pages 
<br/><br/>
<br/><br/><label>ISBN: </label>0-7131-2465-2 
<br/><br/><label>Dewey Class. No.: </label>574.5263 B2611 1974