Stebbins, G. Ledyard  1906- <br/><br/>
The basis of progressive evolution / 
G. Ledyard Stebbins 
 - Chaper Hill :  University of North Carolina,  1969. 
 - 150 p. :  ill. ;  21 cm. 
 - John W. Harrelson lectures, .
<br/><br/>Includes index and bibliography : p. 147-148. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Evolution.<br/>Genetics.