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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.

This map features eight expedition routes across the South China Sea from 1752 to 1763. The web of lines is a rhumbline network, and bathymetry (sea depth) is marked. The place names are in French, but with an English title and notes.