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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Blackburn, Kathleen B. - Harrison, J W Heslop
    Type: Article
    In: Annals of botany
    Volume: 35
    Date: 1921-04
    Page Range: 159--188
    Publication Info: London, Academic Press [etc.],
  2. By: Bagnall, Richard S - Harrison, J W Heslop
    Type: Article
    In: Transactions of the Entomological Society of London
    Volume: 65
    Date: 1918
    Page Range: 346--348
    Publication Info: London, The Society,