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This geological map of the district of Toboali (Bangka Island, east of Sumatra) uses colours to depict types of rocks, soils and minerals. Tin mining areas are also highlighted.

Regional and local borders are colour-coded, with mountains and rivers, settlements, paths/roads and names of local peoples marked. Notes such as ‘Gold dust found in these streams’ and ‘Rich in Tin’ add detail. Only two of four sheets are available.