Columbia subject headings:
Hamburg (Germany)--Economic conditions.
Labor movement--Germany--Hamburg--History.
Harvard subject headings:
Hamburg (Germany)--Economic conditions.
Labor movement--Germany--Hamburg--History.
Working class--Germany--Hamburg--History.
Princeton subject headings:
Hamburg (Germany)--Social conditions.
Labor movement--Germany (West)--Hamburg--Political activity--History.
Working class--Germany (West)--Hamburg--History.