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| 084 | 085 |
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| Quiggin, Alison Hingston. A SURVEY OF PRIMITIVE MONEY: THE BEGINNINGS OF CURRENCY. Reprint. London: Spink & Son, 1978. |
| p75 |
| WESTERDIJK, H. Izerwerk van Centraal- Afrika. (Ironwork of Central Africa) Rotterdam 1975. 154 Pages, 15b/w, 650 line, 3 maps. Text: Dutch |
| p140 #25 |
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