Buchsbaum, Ralph Morris,  1907- <br/><br/>
Animals without backbones. 

 - 3rd ed. / 
 - Chicago :  University of Chicago Press,  1987. 
 - x, 572 p. :  ill. ;  24 cm. 
<br/><br/>Includes bibliographical references and index. 
<br/><br/><label>ISBN: </label>0226078736 0226078744 (pbk.) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Invertebrates.
<br/><br/><label>Dewey Class. No.: </label>592