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Manganese investigations. [No.] 9., Ore-dressing studies of manganese ores : concentration of manganiferous iron ore from the Armour No. 1 mine, Ironton, Minn
- "Ore-dressing studies of manganese ores"@en
- "Concentration of manganiferous iron ore from the Armour No. 1 mine, Ironton, Minn"@en
- "Manganese investigations. [No.] 9., Ore-dressing studies of manganese ores : concentration of manganiferous iron ore from the Armour No. 1 mine, Ironton, Minn"@en
- "Manganese investigations. [No.] 9., Ore-dressing studies of manganese ores concentration of manganiferous iron ore from the Armour No. 1 mine, Ironton, Minn"@en