Howard, L. O. <br/><br/>
The parasite element of natural control of injurious ensects and its control by man 

<br/><br/> Sobretiro de : Smithsonian report 1926. pp. 411-420, 1927 
<br/><br/><label>LCCN: </label>16643 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Control biológico de plagas.