By Norman Allen and C. S. Creighton, 
Entomology Research Division, 
Agricultural Research Service 
Growth Through Agricultural Progress 
Washington, D.C. Issued April 1962 
For sale by the Superintendent of Documents, U.S. Government Printing Office, 
Washington 25, D.C. — Price 5 cents. 
U.S. GOVERNMENT PRINTING OFFICE : 1962—O-623367 
