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KITLV Demmeni J. Batu Kalong boulder carved with figures in Cehan tributary of the Upper Mahakam in Central Borneo .tif nl Batoe Kalong rotsblok met gebeitelde figuren in de Tjehan zijrivier van de Boven Mahakam op MiddenBorneo Borneoexpeditie onder leiding van dr Nieuwenhuis en Batu Kalong boulder carved with figures in Cehan