Hurd, Paul D., Jr. <br/><br/>
The principal Larrea bees of the Southwestern united States Hymenoptera  :Apoidea) 

 - Washington :  Smithsonian Institution,  1975 
 - 74 p.  : gráfs. 
 - Smithsonian contributions to zoology  ; 193 .
 - Smithsonian contributions to zoology  ; 193 .
<br/><br/><label>LCCN: </label>17436 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Abejas.<br/>Abejas--Hábitos y conducta.<br/>Larrea tridentata.