Louis L. Pyenson <br/><br/>
Elements of plant protection 

 - New York  John Wiley and Sons Inc  1951 
 - 538p 
<br/><br/>Louis L. Pyenson: Elements of plant protection.  New York.  John Wiley and Sons Inc, 1951.--(632.9PYE)   
<br/><br/><br/>ENGLISH 
<br/><br/><label>Dewey Class. No.: </label>632.9  / PYE