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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.

Map of the Indian Ocean showing the currents (represented by arrows), including during the North East and North West monsoons. Numbers on the arrows indicate the current’s speed.

Map of Dutch colonial territory in Southeast Asia, including the administrative areas of Java and Madura. Two maritime routes are marked from Batavia to the Maluku Islands: of the brig ‘Douga’ in 1825, and by Baron Godert van der Capellen in 1824.

Map of Dutch colonial territory in Southeast Asia, including the administrative areas of Java and Madura. Two maritime routes are marked from Batavia to the Maluku Islands: of the brig ‘Douga’ in 1825, and by Baron Godert van der Capellen in 1824.