Ouvrage Rochonvillers
... that the name of Ouvrage Rochonvillers of the Maginot Line was a state secret until 1971?
... that the name of <b id="mwE5w"><a href="./Ouvrage_Rochonvillers" id="mwE50" rel="mw:WikiLink" title="Ouvrage Rochonvillers">Ouvrage Rochonvillers</a></b> of the <a href="./Maginot_Line" id="mwE54" rel="mw:WikiLink" title="Maginot Line">Maginot Line</a> was a state secret until 1971?