Não informado. (1964). Coal, gold and base minerals of Southern Africa. Pithead Press.
Citace podle Chicago (17th ed.)Não informado. Coal, Gold and Base Minerals of Southern Africa. Johannesburg, Africa do Sul: Pithead Press, 1964.
Citace podle MLA (8th ed.)Não informado. Coal, Gold and Base Minerals of Southern Africa. Pithead Press, 1964.
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