Contribution to the geology of the district Kota-Waringin and the district Ketapang RUSP. situated in the residencies of Southern-and Eastern-and Western division of Borneo by the temporary engineer with the mining-Bureau
Contribution to the geology of the district Kota-Waringin and the district Ketapang resp. situated in residencies of the southern- and eastern- and western division of Borneo by the temporary engineer with the mining-bureau Ir. H.Frijling using the data collected by J.E. Loth and J.W.H. Adam