Não informado. (1962). Annals of the Geological Survey. Republic of South Africa, Department of Mines.
Cita Chicago Style (17a ed.)Não informado. Annals of the Geological Survey. Pretoria, Africa do Sul: Republic of South Africa, Department of Mines, 1962.
Cita MLA (8a ed.)Não informado. Annals of the Geological Survey. Republic of South Africa, Department of Mines, 1962.
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