Não informado. (1949). Mining transactions. American Institute of Mining, Metallurgical and Petroleum Engineers.
Lua i Stíl Chicago (17ú heag.)Não informado. Mining Transactions. New York: American Institute of Mining, Metallurgical and Petroleum Engineers, 1949.
Lua MLA (8ú heag.)Não informado. Mining Transactions. American Institute of Mining, Metallurgical and Petroleum Engineers, 1949.
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