Columbia subject headings:
Labor unions--Germany--Hannover--History.
Socialism--Germany--Hannover--History.
Working class--Germany--Hannover--History.
Harvard subject headings:
Labor movement--Germany--Hannover--History.
Labor unions--Germany--Hannover--History.
Socialism--Germany--Hannover--History.
Socialism--Germany--Hannover.
Princeton subject headings:
Labor unions--Germany--Hannover--History.
Socialism--Germany--Hannover--History.
Working class--Germany--Hannover--History.