Columbia subject headings:
Harvard subject headings:
Germany--History--Revolution, 1918--Congresses.
Rhineland (Germany)--History--20th century--Congresses.
Westphalia (Germany)--History--20th century--Congresses.
Princeton subject headings:
Germany--History--Revolution, 1918--Congresses.
Rhineland (Germany)--History--20th century--Congresses.
Westphalia (Germany)--History--20th century--Congresses.