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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 the Indian Ocean showing maritime routes, including some to and around Southeast Asia, where they pass through the Strait of Malacca, the Sunda Strait, and the straits between the Lesser Sunda Islands.