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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.

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.

This map focuses on the mountain ranges along the west coast of central Sumatra. Military bases, post offices, villages, rivers and hot springs are also marked, and there are inset maps of the towns of Padang and Singkel (Singkil).