Columbia subject headings:
Harvard subject headings:
Hamburg (Germany)--Social conditions.
Labor and laboring classes--Germany--Hamburg--History.
Political posters, German.
Social conflict--Germany--Hamburg.
Working class--Germany--Hamburg--History.
Princeton subject headings:
Germany--History--1918-1933.
Hamburg (Germany)--Intellectual life.
Socialism--Germany (West)--Hamburg.
Working class--Germany (West)--Hamburg.