Swiggett, G. L. Mining, Metallurgy, Economic Geology and Applied Chemistry.
Lua i Stíl Chicago (17ú heag.)Swiggett, Glen Levin. Mining, Metallurgy, Economic Geology and Applied Chemistry.
Lua MLA (8ú heag.)Swiggett, Glen Levin. Mining, Metallurgy, Economic Geology and Applied Chemistry.
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