Map of the Dutch colonial administrative region of the island of Billiton (Belitung). The population is listed by race, and tin production by year. (From ‘Algemeene Atlas van Nederlandsche Indie [General Atlas of the Dutch East Indies]’.)
Sketch of the Straits of Gaspar
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Map of the Gaspar Strait, off the east coast of Sumatra. The web of lines is a rhumbline network, numbers indicate sea depth (bathymetry), and there are side views of islands (elevations), all to aid navigation. Five 18th century routes are marked.