File:Carte d'État-major de la France, Feuille Châlons-sur-Marne N.O.jpg
![File:Carte d'État-major de la France, Feuille Châlons-sur-Marne N.O.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/3/34/Carte_d%27%C3%89tat-major_de_la_France%2C_Feuille_Ch%C3%A2lons-sur-Marne_N.O.jpg/800px-Carte_d%27%C3%89tat-major_de_la_France%2C_Feuille_Ch%C3%A2lons-sur-Marne_N.O.jpg?20191006174540)
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