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Western bees of the genus Colletes (Hymenoptera: Apoidea).
Author: Timberlake, P. H.
Call no: RP5336
Year: 1951
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Additions and corrections to the list of nearctic species of Dianthidium (Hymenoptera, Apoidea)
Author: Timberlake, P. H.
Call no: RP7520
Year: 1948
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New records of Perdita from the eastern United States
Author: Timberlake, P. H.
Call no: RP7521
Year: 1952
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Descriptions of new species of Nomadopsis from California and Texas, and of a new allied genus from South America
Author: Timberlake, P. H.
Call no: RP7522
Year: 1952
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