Hurd, Paul D., Jr. <br/><br/>
Principal sunflower bees of North America with emphasis on the southwestern United States (Hymenoptera: Apoidea) 

 - Washington :  Smithsonian Institution,  1980 
 - 158 p.  : ilus. 
 - Smithsonian contributions to zoology  ; 310 .
 - Smithsonian contributions to zoology  ; 310 .
<br/><br/><label>LCCN: </label>17437 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Abejas.<br/>Girasol.<br/>Plantas e insectos.
<br/><br/><label>Dewey Class. No.: </label>595.799  / H87