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| Quiggin, Alison Hingston. A SURVEY OF PRIMITIVE MONEY: THE BEGINNINGS OF CURRENCY. Reprint. London: Spink & Son, 1978. |
| p87,plate1 |
| WESTERDIJK, H. Izerwerk van Centraal- Afrika. (Ironwork of Central Africa) Rotterdam 1975. 154pp., 15b/w, 650 line, 3 maps. Text: Dutch |
| p134#E,F |
| Roberto Ballarini, Ferrie Monete dell' Africa Equatoriale, Galleria Africa Curio-Milano 1998. Pgs 37. |
| p2 |
| Roberto Ballarini, Armi Bianche Dell'Africa Nera (Black Africa's Traditional Arms), Africa Curio, Milano 1992.Pgs 128 |
| p25#8 |
| Eyo, Ekpo. NIGERIA AND THE EVOLUTION OF MONEY. Lagos: Central Bank of Nigeria, 1979. |
| p52 |
| Tom Joyce, Univ. of NC exhibition. Life Force at the Anvil, The Blacksmith's Art from Africa. Exhibition May - August 1998. Pgs 32 |
| p22 figure 34 |
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