Principal sunflower bees of North America with emphasis on the Southwestern United States (Hymenoptera, Apoidea) /
Hurd, Paul David, 1921-
Principal sunflower bees of North America with emphasis on the Southwestern United States (Hymenoptera, Apoidea) / Paul D. Hurd, Jr., Wallace E. LaBerge, and E. Gorton Linsley. - Washington : Smithsonian Institution Press, 1980. - III, 158 p. : ill. ; 27 cm. - Smithsonian Contributions to Zoology ; 310 .
Principal sunflower bees of North America with emphasis on the Southwestern United States (Hymenoptera, Apoidea) / Paul D. Hurd, Jr., Wallace E. LaBerge, and E. Gorton Linsley. - Washington : Smithsonian Institution Press, 1980. - III, 158 p. : ill. ; 27 cm. - Smithsonian Contributions to Zoology ; 310 .