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On this map of the east coast of northern Sumatra, red borders divide the land into agricultural properties, each with a number to identify it. The whole area is divided into colour-coded administrative districts.

A map of the railway/tramway system of the Deli district on the northeast Sumatra coast. Existing and projected lines are shown, with stops and stations, as well as ‘draagbaar’ railways (a railway with movable tracks made by the Decauville company).

Map of tobacco plantations in three regencies on the east coast of Sumatra. Each plantation is marked in red with the name of the brand under which its tobacco is imported into the Netherlands. Roads, railways and rivers are also shown.

Rivers and crops are the focus of this map of the northeast coast of Sumatra. Forests and wetlands are marked, as are alang-alang, coconut, pepper, nutmeg and tobacco. Roads are shown as suitable for infantry and light artillery, or for horse riding.

Map of three regions on the northeast coast of Sumatra, with each region divided into parcels of land which are labelled with the name of a company. Presumably, these companies have been issued the contracts mentioned in the map’s title.