John Charles Walker <br/><br/>
Plant pathology 

 - 2nd Ed 
 - New York  Mc Graw Hill Book Co 
 - 819p 
<br/><br/>John Charles Walker: Plant pathology.  (2nd Ed)  New York.  Mc Graw Hill Book Co,--(632.3WAL)   
<br/><br/><br/>ENGLISH 
<br/><br/><label>Dewey Class. No.: </label>632.3  / WAL