Urban Resources : jean bernard wahl, maginot line, ligne maginot, hochwald

	Hochwald - Une forteresse en Alsace, 1999 Monograph dedicated to the biggest and still in use fortress of the Maginot Line. Read more
	La ligne Maginot en Alsace, 200 kilomètres de béton et d'acier, 1987 Historical study of the Maginot Line in Alsace. Read more