Walker, J. C. ( John Charles )  ,1893- <br/><br/>
Plant pathology. 

 - 3d ed. 
 -  McGraw-Hill New York  1969  [1969] 
 - xi, 819 p.illus.23 cm. 
 - McGraw-Hill publications in the agricultural sciences .
<br/><br/> Includes bibliographies. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Plant diseases.--SB
<br/><br/><label>LC Class. No.: </label>SB731.W235 1969