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  1. By: Hartmann, H E K - Bittrich, V
    Type: Article
    In: Bothalia
    Volume: 20
    Issue: 2
    Date: 1990-10-17
    Page Range: 153--157
    Publication Info: Pretoria Botanical Research Institute, Dept. of Agricultural Technical Services 1921-
  2. By: Hartmann, H E K
    Type: Article
    In: Bothalia
    Volume: 17
    Issue: 2
    Date: 1987-10-23
    Page Range: 205--212
    Publication Info: Pretoria Botanical Research Institute, Dept. of Agricultural Technical Services 1921-
  3. By: Hartmann, H E K
    Type: Article
    In: Bothalia
    Volume: 19
    Issue: 2
    Date: 1989-12-19
    Page Range: 179--182
    Publication Info: Pretoria Botanical Research Institute, Dept. of Agricultural Technical Services 1921-