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• Zinc smelting in the horizontal retort fired with natural gas.
• Zinc smelting in the horizontal retort fired with natural gas.
• Zinc smelting in the horizontal retort fired with natural gas.
• Zinc smelting in the horizontal retort fired with natural gas :
• Selective flotation concentration of lead-zinc ores from the Musick and Helena mines, Bohemia District, Oreg.