Columbia subject headings:
Germany--Politics and government--1789-1900.
Germany--Politics and government--20th century.
Social classes--Germany--History--19th century.
Social classes--Germany--History--20th century.
Harvard subject headings:
Germany--Politics and government--1789-1900
Germany--Politics and government--20th century
Social classes--Germany--History--19th century.
Social classes--Germany--History--20th century.
Princeton subject headings:
Germany--Politics and government--1789-1900.
Germany--Politics and government--20th century.
Social classes--Germany--History--19th century.
Social classes--Germany--History--20th century.