Columbia subject headings:
Harvard subject headings:
Labor movement--Germany--Hannover--History.
Metal-workers--Labor unions--Germany--Hannover--History.
Princeton subject headings:
Industries--Germany--Hannover--History--19th century.
Industries--Germany--Hannover--History--20th century.
Labor movement--Germany--Hannover--History--19th century.
Labor movement--Germany--Hannover--History--20th century.
Metal-workers--Germany--Hannover--History--19th century.
Metal-workers--Germany--Hannover--History--20th century.
Metal-workers--Labor unions--Germany--Hannover--History--19th century.
Metal-workers--Labor unions--Germany--Hannover--History--20th century.