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

 - Los Angeles  University of California Press  1952 
 - 166p 
<br/><br/>E.O. Essig & Frieda Abernathy: Aphid genus periphyllus : A systematic, biological and ecological study.  Los Angeles.  University of California Press, 1952.--(632.752ESS)   
<br/><br/><br/>ENGLISH 
<br/><br/><label>Dewey Class. No.: </label>632.752  / ESS