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By: Scully, G O - Walker, A. R. E.Type: ArticleIn: Transactions of the Royal Society of South AfricaVolume: 4Series:Issue:Date: 1914Page Range: 65--67Publication Info: Cape Town, Royal Society of South Africa,Subjects:
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By: Walker, A. R. E.Type: ArticleIn: Transactions of the Royal Society of South AfricaVolume: 6Series:Issue:Date: 1917Page Range: 193--202Publication Info: Cape Town, Royal Society of South Africa,Subjects:
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By: Lingen, J. Steph. van der - Walker, A. R. E.Type: ArticleIn: Transactions of the Royal Society of South AfricaVolume: 10Series:Issue:Date: 1922Page Range: 239--244Publication Info: Cape Town, Royal Society of South Africa,Subjects: