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| Quiggin, Alison Hingston. A SURVEY OF PRIMITIVE MONEY: THE BEGINNINGS OF CURRENCY. Reprint. London: Spink & Son, 1978. |
| p103,plate1 |
| Opitz, Charles J. ODD AND CURIOUS MONEY: DESCRIPTIONS AND VALUES. Second Edition. Ocala, FL: First Impressions Printing, 1991. |
| p38 |
| Roberto Ballarini, Armi Bianche Dell'Africa Nera (Black Africa's Traditional Arms), Africa Curio, Milano 1992.Pgs 128 |
| p118#77 |
| Primitive Money |
| p19 |
| Money You Don't Tuck In Your Wallet |
| p50 |
| German Museum Collection - |
| p? |
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