Columbia subject headings:
Harvard subject headings:
Bremen (Germany)--History--20th century--Congresses.
Germany--History--Revolution, 1918--Congresses.
Germany--Politics and government--1918-1933--Congresses.
Soviet Union--History--Revolution, 1917-1921--Influence--Congresses.
World War, 1914-1918--Germany--Bremen--Congresses.
Princeton subject headings:
Bremen (Germany)--History--Congresses.
Conference papers and proceedings.
Germany--History--Revolution, 1918--Congresses.
Soviet Union--History--Revolution, 1917-1921--Congresses.