Reference | {Commodity:: METAL BULLETIN, P. 5 (FEB. 4, 1993).}{Deposit:: ROSKILL. THE ECONOMICS OF ZINC. 1990.}{Deposit:: WORLD BANK. A STUDY OF THE SOVIET ECONOMY. FEB. 1991.}{Deposit:: INTERFAX. MINING REPORT. MAY 4, 1992.}{Deposit:: INTERFAX. MINING REPORT. JULY 31, 1992.}{Deposit:: CRU STUDY. 1991.}{Deposit:: METAL BULLETIN. APRIL 29, 1993.} |