GERKING ,Shelby.D. <br/><br/>
Biology Systems 

 - 2nd ed 
 - London  W.B. Saunders  1974 
 - 506p. 
<br/><br/><label>ISBN: </label>0-7216-4101-6 
<br/><br/><label>Dewey Class. No.: </label>574