TY  - BOOK
AU  - Davis,John J.
AU  - Packard,C.M.
TI  - The corn root aphid and methods of controlling it
T2  - Farmers' bulletin,
AV  - S21 .A6 rev. no. 891b
PY  - 1949///]
CY  - Washington
PB  - U. S. Govt. Print. Off.
KW  - Corn root-aphis
N1  - Contribution from Bureau of Entomology and Plant Quarantine
ER  -