Columbia subject headings:
Deutscher Nationalverein--History.
Germany--Politics and government--1848-1870.
Liberalism--Germany--History--19th century.
Middle class--Political activity--Germany--History--19th century.
Harvard subject headings:
Deutscher Nationalverein--History.
Germany--Politics and government--1848-1870.
Liberalism--Germany--History--19th century
Middle class--Germany--Political activity--History--19th century.
Princeton subject headings:
Germany--History--1848-1870.
Germany--Politics and government--1848-1870.
Middle class--Germany--History--19th century.
Middle class--Germany--Political activity--History.