Optical telegraphy. Military of the French colonial army checking the optical telegraphy devices, Vietnam, Indochina, Asia. Thirty months in Tonkin 1885 by Doctor Charles Edouard Hocquard (1853 - 1911)

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Size: 7087px × 3501px
Photo credit: © Old Books Images / Alamy / Afripics
License: Licensed
Model Released: No

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