Knowlton, George F. <br/><br/>
Potato psyllid investigations 

<br/><br/> Sobretiro de : Proc. Utha Academy of Sciences, Astrts and Letters. 11 : 261-265, 1934 
<br/><br/><label>LCCN: </label>28489 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Paratrioza cockerelli.