Não informado. (2020). Mining and Metallurgy. W.J. Johnston.
Lua i Stíl Chicago (17ú heag.)Não informado. Mining and Metallurgy. New York: W.J. Johnston, 2020.
Lua MLA (8ú heag.)Não informado. Mining and Metallurgy. W.J. Johnston, 2020.
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