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A map recording five Dutch expeditions through the Karo Lands of northern Sumatra. The mountainous terrain is represented by contour lines, with peaks’ heights marked. The names of groups of the indigenous Karo people are shown in large letters.

A map recording five Dutch expeditions through the Karo Lands of northern Sumatra. The mountainous terrain is represented by contour lines, with peaks’ heights marked. The names of groups of the indigenous Karo people are shown in large letters.

Map of the island of Nias off the west coast of Sumatra. Nias and Muslim villages are marked separately; large interior areas are left blank (‘Niet onderzocht [Not researched]’). Anchor points and side views of hills (elevations) are for navigation.