Não informado. (1949). Mining transactions. American Institute of Mining, Metallurgical and Petroleum Engineers.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Mining Transactions. New York: American Institute of Mining, Metallurgical and Petroleum Engineers, 1949.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Mining Transactions. American Institute of Mining, Metallurgical and Petroleum Engineers, 1949.
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