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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Miall, L. C. (Louis Compton), - Walker, Norman - Osten-Sacken, C. R. (Carl Robert),
    Type: Article
    In: Transactions of the Entomological Society of London
    Volume: 43
    Date: 1895
    Page Range: 141--153
    Publication Info: London, The Society,
  2. By: Walker, Norman
    Type: Article
    In: Annals of botany
    Volume: 27
    Date: 1913-01
    Page Range: 115--132
    Publication Info: London, Academic Press [etc.],