Davis, John J.  1885-1965 <br/><br/>
The corn root aphid and methods of controlling it. 
[Rev. May 1949 by C.M. Packard. 
 - Washington,  U. S. Govt. Print. Off.,  1949] 
 - 7 p.  illus.  24 cm. 
 - Farmers' bulletin,  no. 891 .
 - Farmers' bulletin (United States. Department of Agriculture)  no. 891. .
<br/><br/> Contribution from Bureau of Entomology and Plant Quarantine. 
<br/><br/><label>LCCN: </label>agr49000586  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Corn root-aphis.
<br/><br/><label>LC Class. No.: </label>S21  / .A6 rev. no. 891b