Johnson, Clifford,  1932- <br/><br/>
Introduction to natural selection / 
Clifford Johnson. 
 - Baltimore :  University Park Press,  1976. 
 - viii, 213 p. :  ill. ;  24 cm. 
<br/><br/> Includes index. 
<br/><br/><label>ISBN: </label>0839109369 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Natural selection.