Toxicity of Dipyridyls and certain other organic compounds as contact insecticides /
Richardson, Charles H.
Toxicity of Dipyridyls and certain other organic compounds as contact insecticides / by Charles H. Richardson and C. R. Smith - Washington : Govt. Print. Office, 1926 - 597-609 p. : ill. ; 26 cm - Journal of agricultural research ; 33 .
Toxicity of Dipyridyls and certain other organic compounds as contact insecticides / by Charles H. Richardson and C. R. Smith - Washington : Govt. Print. Office, 1926 - 597-609 p. : ill. ; 26 cm - Journal of agricultural research ; 33 .