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| Quiggin, Alison Hingston. A SURVEY OF PRIMITIVE MONEY: THE BEGINNINGS OF CURRENCY. Reprint. London: Spink & Son, 1978. |
| p67 |
| Opitz, Charles J. ODD AND CURIOUS MONEY: DESCRIPTIONS AND VALUES. Second Edition. Ocala, FL: First Impressions Printing, 1991. |
| p25 |
| Roberto Ballarini, Armi Bianche Dell'Africa Nera (Black Africa's Traditional Arms), Africa Curio, Milano 1992. 128 Pages. |
| p110 #68 |
| Karl-Ferdinand Schoedler, Earth and Ore, 2500 Years of African Art in Terra-cotta and Metal. Panterra Verlag 1997. 369 Pages and maps. |
| p327 #634 |
| Tom Joyce, Univ. of NC exhibition. Life Force at the Anvil, The Blacksmith's Art from Africa. Exhibition May - August 1998. 32 Pages. |
| p25 figure 10 |
| Claudia Zaslavsky, Africa Counts: Number and Pattern in Africa Culture, Prindle, Weber & Schmidt, 1973. |
| p? figure 7 & 8 |
| Other People's Money, Money in Africa |
| p? |
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