Insects;  The Yearbook of Agriculture 

 - Washington, D.C.  United States Government Printing Office 
 - xviii, 780 p.:  ill.,  23 cm. 
<br/><br/>Includes bibliographical references and index. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Agricultural ests.<br/>Economic entomology<br/>Beneficial insects
<br/><br/><label>Dewey Class. No.: </label>630  / US