G. Ledyard Stebbins <br/><br/>
Basis of progressive evolution 

 - N carolina  University Of North Carolina Press  1969 
 - 150p 
<br/><br/>G. Ledyard Stebbins: Basis of progressive evolution.  N carolina.  University Of North Carolina Press, 1969.--(575STE)   
<br/><br/><br/>ENGLISH 
<br/><br/><label>Dewey Class. No.: </label>575  / STE