Cotterill, C., Cotterill, C. H., & Cigan, J. M. (1970). AIME World Symposium on mining & metallurgy of lead & zinc. New York: American Institute of Mining, Metallurgical, and Petroleum Engineers.
Παραπομπή Chicago StyleCotterill, Carl, Carl H. Cotterill, and John M. Cigan. AIME World Symposium On Mining & Metallurgy of Lead & Zinc. New York: American Institute of Mining, Metallurgical, and Petroleum Engineers, 1970.
Παραπομπή MLACotterill, Carl, Carl H. Cotterill, and John M. Cigan. AIME World Symposium On Mining & Metallurgy of Lead & Zinc. New York: American Institute of Mining, Metallurgical, and Petroleum Engineers, 1970.
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