Columbia subject headings:
France--History, Military--20th century.
France. Armée--History--World War, 1914-1918.
France. Gendarmerie nationale--History--20th century.
World War, 1914-1918--France.
Harvard subject headings:
France. Armée--History--World War, 1914-1918.
France. Gendarmerie nationale
Intelligence service--France--History--20th century.
World War, 1914-1918--France
World War, 1914-1918--Military intelligence--France.
Princeton subject headings:
France. Armée--History--World War, 1914-1918.
France. Gendarmerie nationale
World War, 1914-1918--France.