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

 - 2 
 -  McGraw-Hill Book Co., New York  1957 
 - 707 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Plant pathology; Botany
<br/><br/><label>Dewey Class. No.: </label>PG 581.2  WAL-P2