Não informado. (2020). Bi-Monthly Bulletin of the American Institute of Mining Engineers. American Institute of Mining Engineers.
Lua i Stíl Chicago (17ú heag.)Não informado. Bi-Monthly Bulletin of the American Institute of Mining Engineers. New York: American Institute of Mining Engineers, 2020.
Lua MLA (8ú heag.)Não informado. Bi-Monthly Bulletin of the American Institute of Mining Engineers. American Institute of Mining Engineers, 2020.
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