Curtis,Helena. <br/><br/>
Biology. 

 - 3rd  ed. 
 - New york :  Worth publishers,  1968. 
 - 1043  p. :  ill ;    cm. 
<br/><br/>index. 
<br/><br/><label>ISBN: </label> $ 
<br/><br/><label>Subjects--Topical Terms: </label><br/>biology.