Penetration of certain liquids through the pronotum of the american roach  / 
W. C. O'kanel 
 - Durham, N. H.  :   Agricultural Experiment Station 
 - 15 p. 
 - New Hampshire Agri. Exp. Sta. Tech. bull; 74 .
<br/><br/><label>LCCN: </label>202745 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Insecticidas  Cucarachas