McGregor, S.E.  <br/><br/>
Insect pollination of cultivated crop plants  (Book) 

 - Washington, D.C.  United States Department of Agriculture  1976 
 - 411 p.  30 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Plants, Cultivated Pollination by insects
<br/><br/><label>Universal Decimal Class. No.: </label>631.522.221:633.1 MAC  / 6366