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| 094 |
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| WESTERDIJK, H. Izerwerk van Centraal- Afrika. (Ironwork of Central Africa) Rotterdam 1975. 154pp., 15b/w, 650 line, 3 maps. Text: Dutch |
| p141 #26,27 |
| Opitz, Charles J. ODD AND CURIOUS MONEY: DESCRIPTIONS AND VALUES. Second Edition. Ocala, FL: First Impressions Printing, 1991. |
| p22 |
| Roberto Ballarini, Armi Bianche Dell'Africa Nera (Black Africa's Traditional Arms), Africa Curio, Milano 1992. 128 Pages. |
| pp113#71 |
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