maybe this can help;
BOCOUM, HAMADY. (ED.).
THE ORIGIN OF IRON METALLURGY IN AFRICA. NEW LIGHT ON ITS ANTIQUITY: WEST AND CENTRAL AFRICA.
240 pp.; 87 b/w & colour photos, 13 b/w figs., tables, index, biblio.. Series: Memory of Peoples. Paris, 2004. Pbk.
EERHART, FRANK.
THE POWER OF IRON IN AFRICA.
218 pp.; 250 colour illus., biblio.. Eindhoven, 2013. Hbk. Frank Eerhart has been collecting African iron objects for over 25 years. His collection is presented in this publication for the first time. In 13 chapters he sheds light on the provenance, the use of the objects and their function in various African societies.
SCHMIDT, PETER R.
IRON TECHNOLOGY IN EAST AFRICA. SYMBOLISM, SCIENCE, AND ARCHAEOLOGY.
400 pp.; 111 b/w illus., 51 figs., index, biblio.. Bloomington, 1997. Pbk.
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