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MINERALOGICAL-GEOCHEMICAL FEATURES OF THE OXIDATION OF MANGANESE CARBONATE ORES, THE BURSHTYN DEPOSIT, UKR. SSR.YANCHUK EA; YANCHUK EH A; KHMELEVSKY VA et al.1980; CONGRES GEOLOGIQUE INTERNATIONAL. 26/1980/PARIS; FRA; ORLEANS: B.R.G.M.; DA. 1980; VOL. 3; PP. 1034Conference Paper