Knipling, E. F. <br/><br/>
Population density relationships between hymenopterous parasites and their aphid hosts--a theoretical study / 
by E. F. Knipling and J. E. Gilmore 
 - Washington, D.C. :  U.S. Agricultural Research Service,  1971 
 - ii, 34 p. ;  24 cm. 
 - Department of Agriculture. Technical bulletin ;  no. 1428 .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Aphidiidae<br/>Insects--Parasites
<br/><br/><label>Dewey Class. No.: </label>632.79