Richardson, Charles H <br/><br/>
Studies on contact insecticides  / 
by Charles H. Richardson and C. R. Smith 
 - Washington  :   Department of Agriculture 
 - 16 p. 
 - EUA. Dept. of Agri. Bull.; 1160 .
<br/><br/><label>LCCN: </label>203775 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Insecticidas -- Análisis  Insecticidas de contacto