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  1. By: Walker, A R E
    Type: Article
    In: Transactions of the Royal Society of South Africa.
    Volume: 6
    Date: 1917
    Page Range: 193--202
    Publication info: Cape Town,Royal Society of South Africa.
  2. By: Scully, G O - Walker, A R E
    Type: Article
    In: Transactions of the Royal Society of South Africa.
    Volume: 4
    Date: 1914
    Page Range: 65--67
    Publication info: Cape Town,Royal Society of South Africa.
  3. By: Lingen, J S V D - Walker, A R E
    Type: Article
    In: Transactions of the Royal Society of South Africa.
    Volume: 10
    Date: 1922
    Page Range: 239--244
    Publication info: Cape Town,Royal Society of South Africa.