Columbia subject headings:
Harvard subject headings:
Artisans--Germany--Political activity--History.
Germany--Social conditions.
Labor unions--Germany--History
Merchants--Germany--Political activity--History.
Middle class--Germany--History
Middle class--Germany--Political activity--History.
Princeton subject headings:
Artisans--Germany--Political activity--History.
Merchants--Germany--Political activity--History.
Middle class--Germany--Political activity--History.