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A geological map of western Borneo made by a mine engineer, showing the types of soil, coal, clay, and rock (limestone, sandstone, granite, basalt), as well as gold, diamonds, tin, copper and iron found along the rivers.

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.