Essig E O <br/><br/>
Aphid genus periphyllus: A systematic biological and ecological study 

 - Berkeley  University of California         1952 
 - ix, 166p.  cm. 
<br/><br/><label>Standard No.: </label>54234 
<br/><br/><label>Source: </label> Textual 
<br/><br/><label>Subjects--Topical Terms: </label><br/> Arthropoda<br/>Zoology
<br/><br/><label>Dewey Class. No.: </label>K8772, J2-;1