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By: Dreyer, T FType: ArticleIn: Transactions of the Royal Society of South AfricaVolume: 4Series:Issue:Date: 1914Page Range: 241--258Publication Info: Cape Town, Royal Society of South Africa,Subjects:
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By: Dreyer, T FType: ArticleIn: Transactions of the Royal Society of South AfricaVolume: 3Series:Issue:Date: 1913Page Range: 139--146Publication Info: Cape Town, Royal Society of South Africa,Subjects: