Columbia subject headings:
Harvard subject headings:
Labor movement--Germany--History--19th century.
Power (Social sciences)--Germany--History--19th century.
Socialism--Germany--19th century.
Socialism--Germany--History--19th century
Princeton subject headings:
Labor movement--Germany--History--19th century.
Power (Social sciences)--Germany--History--19th century.
Socialism--Germany--History--19th century.