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A late 19th century map of the Minahasa Peninsula, northern Celebes (Sulawesi), marked with the locations of mines (‘mÿnen’). The red borders indicate areas for ‘mijnbouwkundig onderzoek [mining research]’.

A geological map, spread over eight sheets, showing the types of rock and minerals found in the Oembilien coalfield, in the Padang Highlands on Sumatra’s west coast. There are also additional geological profiles.

A geological map showing the types of rock and minerals found in Blinjoe district on the island of Bangka, off the east coast of Sumatra. Deposits of iron, quartz and tin are marked, and coral is shown at the coast.