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  1. By: Gonzalez, Victor H. - Engel, Michael S.
    Type: Article
    In: ZooKeys
    Volume: 111
    Date: 2011
    Page Range: 41-49
    Publication Info: Sofia, Bulgaria Pensoft Publishers
    Subjects: Ctenoplectrellini  Eocene  Hymenoptera  Megachilidae  Megachilinae  Paleontology  taxonomy  Tertiary