t 



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Fig. 18. This Piper Cub Airplane is Spraying a DDT Formula- 

 tion Over Mosquito-Infested Terrain. This Treatment Kills 

 Mosquitoes and Larvae as Well as Adult Stages 

 OF Their Life Cycle. 



(Courtesy of U. S. Dept. of Agriculture. Photo by Knell) 



( ';s ) 



