00520nam a2200169Ia 4500001001000000003000500010008004100015010001100056040000900067100002600076245008200102260004600184300001000230440003600240650005700276700001700333Para_5434CHAP220125s1923    xx            000 0 und d  a203775  cCHAP  aRichardson, Charles H  aStudies on contact insecticides  /c by Charles H. Richardson and C. R. Smith  aWashington  :b Department of Agriculture  a16 p.  aEUA. Dept. of Agri. Bull.; 1160  aInsecticidas x Análisis  Insecticidas de contacto  aSmith, C. R.