Buchsbaum, Ralph <br/><br/>
Animals without backbones: an introduction to the invertebrates  Ralph Buchsbaum. 

 - Harmondsworth  Penguin Books  1959 
 - 204p.: ill. 9cm. 
<br/><br/> v.2. 
<br/><br/><label>Dewey Class. No.: </label>592  / B94A