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  1. Two new subgenera of bees in the genus Centris (Hymenoptera: Apidae) / by Ricardo Ayala.
    By: Ayala, Ricardo. - Missouri. Dept. of Conservation.
    Publication info: Lawrence, Kan. :Natural History Museum, University of Kansas,[2002]
    Holding Institution: Harvard University, Museum of Comparative Zoology, Ernst Mayr Library
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