Encyclopedia of the aquatic world:  Sea urchin and sand dollar/ 
Edited by Marian Armstrong 
 - New York :  Marshall Cavendish,  2004. 
 - 1582 p.:  vol. 9  ill.;  29 cm. 
<br/><br/> Includes indexes. 
<br/><br/><label>ISBN: </label>0761474188 (set) 0761474277  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Aquatic organisms--Encyclopedias.
<br/><br/><label>LC Class. No.: </label>DUCE QH90.2.E53