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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]’.

Map of the Minahasa and East peninsulas of Celebes (Sulawesi) focusing on the road system (shown by red lines). There are four inset maps, including one showing indigenous tribal areas, and a list of places with their latitude, longitude and height.

Navigation map of the Celebes Sea, Makassar Strait and Java Sea, with bathymetry (sea depth), maritime routes, shoals and reefs, and landmark coastal mountains to aid navigation. On two sheets, which may not be from the same original map.