World Health Organization <br/><br/>
Ecology and control of vectors in public health : Twenty first report of the WHO expert committee on insecticides 

 - Geneva  World Health Organization  1975 
 - 36p 
<br/><br/><br/>ENGLISH 
<br/><br/><label>ISBN: </label>92-4-120561-X 
<br/><br/><label>Dewey Class. No.: </label>614.4306  / WHO