Reassessment of the evidence for early metallurgy in Niger, West Africa Killick, David ; van der Merwe, Nikolaas J. ; Gordon, Robert B. ; Grébénart, Danilo Abstract Publication: Journal of Archaeological Science Pub Date: July 1988 DOI: 10.1016/0305-4403(88)90036-2 Bibcode: 1988JArSc..15..367K