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Map of Lake Toba and the surrounding area in northern Sumatra, featuring mountains, forests, types of terrain (undergrowth, field, grass), rivers, roads and settlements. There is an inset map that shows the other maps referenced in producing the map.

Detailed topographical map of the east coast of Sumatra, spread over 36 sheets. The area’s farms are listed and shown on the map within yellow borders, with types of crop grown. There is a detailed plan of Medan, and five inset maps of other towns.

A map of the department of Deli, Java, divided into administrative districts, and spread over eight sheets. Rivers, railways, roads and paths, forests and mountains, and crops—rice, coconut, pepper, nutmeg, alang-alang—are marked.