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Map showing an expedition on the Siak river, Sumatra
Vries, Jan Andriesz
Title in the Leupe Catalogue (National Archives): Kaart van een gedeelte van Straat Camper en de Rivier van Siak, van de Mond tot aan Soengi Mapoera.
Charted is the expedition undertaken against Radja Mohammad in 1761, from the sea heading inland via the Siak river (central Sumatra, in the direction of what is today known as Pekanbaru), with many notes and marginalia.
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