Concepts in biology / 
Eldon D. Enger ... [et al.]. 
 - 6th ed. 
 - Dubuque :  Wm. C. Brown Publishers,  1991. 
 - xiii, 535 p. :  ill. (some col.), maps ;  28 cm. 
<br/><br/> Includes index. 
<br/><br/><label>ISBN: </label>0697137465 (pbk.) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Biology.