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Different levels of government monopolies are indicated on this map of the Dutch East Indies by the use of areas of colour (opium trade) and hash marks (salt trade). The inset map of Java is divided into residencies.

An Atlas produced by an expedition in central Sumatra, including: maps of topography, geology, a number of rivers in the region; drawings of mountains, graphs of lengths of roads; family trees of the royal families of Djambi (Jambi) and Palembang.

Crops are marked on this map of Asia: Sumatra and Java have sugar, coffee, tea; the Lesser Sunda Islands and Maluku Islands have cinnamon, nutmeg and clove; mainland Southeast Asia has sugar and cotton. Arrows on the sea indicate currents.

Crops are marked on this map of Asia: Sumatra and Java have sugar, coffee, tea; the Lesser Sunda Islands and Maluku Islands have cinnamon, nutmeg and clove; mainland Southeast Asia has sugar and cotton. Arrows on the sea indicate currents.

A series of four maps of the Indian Ocean—one for each quarter of the calendar year—showing the direction and intensity of the winds, including around the seas of Southeast Asia. There are extensive explanatory notes.

The use of hachures—short lines/dashes that give a sense of the shape and steepness of terrain—highlight the mountain ranges along the west coast of this map of Sumatra. Many rivers flow east from the mountains to the Malacca Strait.

A topographical and geological map of southern Sumatra, over four sheets. Areas of igneous and sedimentary rock, coal, fossils, petroleum, active volcanoes and hot springs are marked, along with mountains, rivers and marshland, roads and settlements.

The use of hachures—short lines/dashes that give a sense of the shape and steepness of terrain—highlight the mountain ranges along the west coast of Sumatra, with rivers flowing east. There is an inset map of the residency of Groot-Atjih (Aceh).

A map of Southeast Asia coloured to indicate the five different language families spoken in the region in the late 19th century. Names of indigenous tribes/languages are marked in red text, with European colonial possessions in grey.

A map of Southeast Asia coloured to indicate the five different language families spoken in the region in the late 19th century. Names of indigenous tribes/languages are marked in red text, with European colonial possessions in grey.

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.