Não informado. (1969). Minerals science and engineering. National Institute for Metallurgy.
Citace podle Chicago (17th ed.)Não informado. Minerals Science and Engineering. Cottesloe, Africa do Sul: National Institute for Metallurgy, 1969.
Citace podle MLA (8th ed.)Não informado. Minerals Science and Engineering. National Institute for Metallurgy, 1969.
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