Opi (sítio arqueológico) (Portuguese Wikipedia)

Analysis of information sources in references of the Wikipedia article "Opi (sítio arqueológico)" in Portuguese language version.

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Holl, Augustin F. C. (6 de novembro de 2009). «Early West African Metallurgies: New Data and Old Orthodoxy». Journal of World Prehistory. 22 (4): 415–438. doi:10.1007/s10963-009-9030-6