Columbia subject headings:
Harvard subject headings:
Collective memory--Germany--History--Congresses.
Communism--Germany--History--Congresses.
Germany--History--Revolution, 1918--Congresses.
Germany--Politics and government--1918-1933--Congresses.
Princeton subject headings:
Collective memory--Germany--History--Congresses.
Communism--Germany--History--Congresses.
Germany--History--Revolution, 1918--Congresses.
Germany--Politics and government--1918-1933--Congresses.