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  1. On the occurrences of Opisthius richardsoni Kirby and Asaphidion yukonense Wickham (Coleoptera, Carabidae) as late Pleistocene fossils
    By: Ashworth, A C - Schwert, D P
    Type: Article
    In: Proceedings of the Entomological Society of Washington.
    Volume: 93
    Date: 1991
    Page Range: 511--514
    Publication info: Washington, etc. :Entomological Society of Washington
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