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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]’.

On this map of the northern tip of the Minahasa Peninsula, the roads have been added in pencil after the map was printed. Similarly, the elevation (side view) of the peninsula’s mountains has the route of a journey added in pencil.