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A late 19th century map depicting a route from Hanoi to That-Khe via Lang-Son (in northern Vietnam, near the border with China at Kouang-Si (Guangxi)). Two inset maps feature plans of military forts, villages, rivers and fields along the route.

A map to aid in the navigation of the rivers leading to Saigon (Ho Chi Minh City, Vietnam). Details include bathymetry (water depth), currents, and a side view (or ‘elevation’) of hills to use as a landmark. Tides are described in written remarks.