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KITLV Demmeni J. Kayans manufacture wooden roof boards Upper Mahakam Central Borneo .tif nl Kajans vervaardigen houten dakplankjes BovenMahakam MiddenBorneo Commissiereis naar Centraal Borneo onder leiding van dr Nieuwenhuis en Kayans manufacture wooden roof boards Upper Mahakam Central Borneo Borneo expedition to CentralBorneo