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Map of Dutch colonial territory in New Guinea and nearby islands, featuring the 1850 route of the Dutch schooner Circe under Lieutenant Brutel de la Rivière. (From ‘Algemeene Atlas van Nederlandsche Indie [General Atlas of the Dutch East Indies]’.)

Map of the Penang Strait, including written instructions on how to navigate the strait. On land, areas of cultivation are marked, with a table listing acreage used for each crop. A boundary with Siam based on an 1831 treaty is also shown.