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  1. By: Walker, David
    Type: Article
    In: Ibis
    Volume: 2
    Issue: 2
    Date: 1860
    Page Range: 165--168
    Publication Info: [London], Published for the British Ornithologists' Union by Academic Press,
  2. By: Plant, Colin W. - Walker, David
    Type: Article
    In: The entomologist's record and journal of variation
    Volume: 111
    Date: 1999
    Page Range: 94--96
    Publication Info: [London s.n