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Geological map of the Minahasa Peninsula, Celebes (Sulawesi) showing rock types. Two more topographical maps show the terrain of the northeast tip of the peninsula, with elevation views including of the volcano Mount Klabat.

Map of the Mahakam River in Borneo, based on an expedition by the Dutch explorer Dr. Anton Nieuwenhuis in the late 19th century. An inset map shows the upper reaches of the river at twice the scale of the main map.

Map of part of the north coast of Kaiser-Wilhelmsland (German New Guinea) spread over two sheets. It focuses on rivers, noting width, depth, temperature, currents, vegetation etc.; and on mountains, showing heights and side views (elevations).

Four maps of areas with lakes in Celebes (Sulawesi), including the lakes and main watershed of the South Peninsula. Three of the maps feature cross-section views (elevations) which show types of rocks.

Very detailed six-sheet map of eastern New Guinea, with numerous inset maps of bays and islands, and other inset maps covering ethnography, explorers of the region, marine routes across the Pacific Ocean, cannibalism, missionaries activity etc.

Navigation map of Kaiser-Wilhelmsland, in German New Guinea. It features bathymetry (sea depth), reefs and shoals, lighthouses (coloured red and yellow) and landmark mountains. A boundary divides German and British colonial territories on New Guinea.

A map recording five Dutch expeditions through the Karo Lands of northern Sumatra. The mountainous terrain is represented by contour lines, with peaks’ heights marked. The names of groups of the indigenous Karo people are shown in large letters.

Maritime map of the Philippines, with inset maps of bays showing bathymetry (sea depth), shoals, reefs and anchor points. There is also an inset map of Taal Volcano, and elevations (side views of terrestrial landmarks like mountains and islands).

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.

On this map of Southeast Asia, borders are outlined and cities underlined in different colours to show the colonial territories of the European powers. On Borneo, the names of indigenous peoples are listed (‘Dayak’s, Papua’s, Bugi’s’).

On this map of Southeast Asia, borders are outlined and cities underlined in different colours to show the colonial territories of the European powers. On Borneo, the names of indigenous peoples are listed (‘Dayak’s, Papua’s, Bugi’s’).