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Afrocentric scholars Ajala Alhaji alloys archaeological argue Artefacts Arts and Culture aspects bellows Bwari carbon Carthage charcoal chief blacksmith clay pipes colonial Council COUNClL FOR ARTS dates Documentation efforts Eurocentric evidence of iron Federal Capital Territory firing furnace types hammers Hausa Hausa language hearth heat implements imported iron independence indigenous technology interviewed involved in iron iron bloom iron metallurgy iron oxide iron scraps iron smelting activities iron smelting sites iron smelting technology iron smiths iron workers iron working technology Jere Kawu knowledge of iron Koro located Mallam meteorites miners mining sites Niger Nigeria's technological noted obtain iron Okpoko origin of iron pit furnace policies possible origin raw materials relevant retired iron Ruhonia Sarkin shaft furnace smelters smelting process Suleja Taruga techniques and methods technological take traditional iron smelting TRADITIONAL IRON TECHNOLOGY trans-Atlantic slave trade tunnels tuyers types found types of furnaces underdeveloped West Africa workshop