Fortifications along the northeastern frontiers of France, built 1873-1885 according to a layout proposed by General Raymond Séré de Rivières, and improved 1886-1914.
Sauf mention contraire ci-dessus, le contenu de cette notice bibliographique peut être utilisé dans le cadre d'une licence CC BY 4.0 / Unless otherwise stated above, the content of this bibliographic record may be used under a CC BY 4.0 license