Hymenoptera of America north of Mexico :
synoptic catalog, second supplement /
prepared by the staff and collaborators of the Hymenoptera Unit, Insect Identification and Parasite Introduction Research Branch, Entomology Research Division, Agricultural Research Service, under the direction of Karl V. Krombein and B.D. Burks.

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Full view   University of Virginia
Full view   University of Minnesota
Full view   no.2 SUP.2 University of Illinois at Urbana-Champaign