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Map of routes to and around Lake Poso, central Celebes (Sulawesi) by the Dutch missionary and ethnographer Albert Christian Kruyt. The legend records types of rocks found at points along the route.

The route of a late 19th century expedition by Dutch geologists, botanists, ethnographers and zoologists is marked on this map of southwest Borneo. Mountain peaks which were surveyed by the geologists are highlighted with a red circle.

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.