Hurd, Paul David, 1921-. <br/><br/>
The principal Larrea bees of the southwestern United States (Hymenoptera, Apoidea) / 
Paul D. Hurd, Jr., and E. Gorton Linsley. 
 - Washington :  Smithsonian Institution Press,  1975. 
 - iii, 74 p. :  ill. ;  26 cm. 
 - Smithsonian contributions to zoology  no.139 .
<br/><br/>Bibliography: p. 70-74. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Bees--Southwest, New.<br/>Insect--plant relationships--Southwest, New.<br/>Creosote bush.<br/>Insects--Southwest, New.