Columbia subject headings:
Harvard subject headings:
Germany--Politics and government--1918-1933--Congresses.
Germany--Social conditions--1918-1933--Congresses.
Working class--Germany (East)--History--20th century--Congresses.
Working class--Germany--History--20th century--Congresses.
Princeton subject headings:
Germany--Politics and government--1918-1933--Congresses.
Germany--Social conditions--1918-1933--Congresses.
Working class--Germany--History--20th century--Congresses.