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| 130 | 131 |
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| Quiggin, Alison Hingston. A SURVEY OF PRIMITIVE MONEY: THE BEGINNINGS OF CURRENCY. Reprint. London: Spink & Son, 1978. |
| p93 |
| Opitz, Charles J. ODD AND CURIOUS MONEY: DESCRIPTIONS AND VALUES. Second Edition. Ocala, FL: First Impressions Printing, 1991. |
| p52 |
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