Não informado. (1957). Bibliography and Subject Index of South African Geology. Geological Survey of South Africa.
Style de citation Chicago (17e éd.)Não informado. Bibliography and Subject Index of South African Geology. Pretoria, Africa do Sul: Geological Survey of South Africa, 1957.
Style de citation MLA (8e éd.)Não informado. Bibliography and Subject Index of South African Geology. Geological Survey of South Africa, 1957.
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