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  1. By: Bieler, Rüdiger - Bradford, Alison
    Type: Article
    In: Nemouria; occasional papers of the Delaware Museum of Natural History
    Volume: 36
    Date: 1991
    Page Range: 1--48
    Publication Info: [Greenville], Delaware Museum of Natural History,
  2. By: Mikkelsen, Paula M. - Bradford, Alison
    Type: Article
    In: Nemouria; occasional papers of the Delaware Museum of Natural History
    Volume: 41
    Date: 1997
    Page Range: 1--76
    Publication Info: [Greenville], Delaware Museum of Natural History,