Jones, David A. <br/><br/>
Variation and adaptation in plant spacies  David A. Jones and Dennis A. Wilkins. 

 - London  Heinemann Educational Books  1971 
 - vi, 184p., ill. 19cm. 
<br/><br/><label>ISBN: </label>0-435-61480-0. 
<br/><br/><label>Dewey Class. No.: </label>581.15,  / J56V