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Navigation map of the southern part of the South China Sea, including the straits of Malacca and Singapore, and the Riau Archipelago. Bathymetry (sea depth), lighthouses, shoals and other obstructions are marked, with hills to use as landmarks.

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.