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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.

This map of the border region between China, Birma (Myanmar), Siam (Thailand and Laos) and Anam (Vietnam) is marked with the routes of five expeditions of the region from 1837 to 1868. Locations of Roman Catholic missionaries are also shown.