Columbia subject headings:
France. Armée. Etat-Major. 2e bureau.
Germany--History--Allied occupation, 1918-1930.
Harvard subject headings:
Espionage--France.
France--History--Third Republic, 1870-1940.
France. Armée Deuxième Bureau.
Germany--History--Allied occupation, 1918-1930.
Military intelligence--France.
Princeton subject headings:
France. Armée. Etat-Major. 2e bureau
Germany--History--Allied occupation, 1918-1930.