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| WESTERDIJK, H. Izerwerk van Centraal- Afrika. (Ironwork of Central Africa) Rotterdam 1975. 154 Pages, 15b/w, 650 line, 3 maps. Text: Dutch |
| p132#G |
| Roberto Ballarini, Ferrie Monete dell' Africa Equatoriale, Galleria Africa Curio-Milano 1998. 37 Pages. |
| p20 |
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