Insects:   The yearbook of agriculture  
/ United States Department of Agriculture  
 - Washington, D.C.:   United States Department of Agriculture,   1952 
 - xviii, 780p.  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Animal husbandry 
<br/><br/><label>Subjects--Index Terms: </label>Insecticides  Field crops  
<br/><br/><label>Universal Decimal Class. No.: </label>638   / J2