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Site: lignemaginot.com (ALSACE - LA LIGNE MAGINOT - FORT DE SCHOENENBOURG)
La Ligne Maginot en Alsace du nord, Le fort de Schoenenbourg, Tourisme historique et militaire, monument d'histoire et de technique, Besichtigung der Maginot Linie im Elsass, die Festung Schoenenbourg, Discover the Maginot Line in Alsace (France) and the fortress Schoenenbourg
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