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  1. By: Dümmer, R A
    Type: Article
    In: Annals of botany
    Volume: 26
    Date: 1912-10
    Page Range: 1123--1124
    Publication Info: London, Academic Press [etc.],
  2. By: Dümmer, R A
    Type: Article
    In: Annals of botany
    Volume: 25
    Date: 1911-10
    Page Range: 1205--1206
    Publication Info: London, Academic Press [etc.],
  3. By: Dümmer, R A
    Type: Article
    In: Annals of botany
    Volume: 26
    Date: 1912-07
    Page Range: 946--947
    Publication Info: London, Academic Press [etc.],
  4. By: Dümmer, R A - Pearson, H H W
    Type: Article
    In: Transactions of the Royal Society of South Africa
    Volume: 3
    Date: 1913
    Page Range: 275--335
    Publication Info: Cape Town, Royal Society of South Africa,