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  1. By: Darwin, Francis, Sir, - Pertz, Dorothea F. M.
    Type: Article
    In: Annals of botany
    Volume: 6
    Date: 1892-10
    Page Range: 245--264
    Publication Info: London, Academic Press [etc.],
  2. By: Farmer, J. B. (John Bretland), - Pertz, Dorothea F. M.
    Type: Article
    In: Annals of botany
    Volume: 6
    Date: 1892-10
    Page Range: 265--270
    Publication Info: London, Academic Press [etc.],