Columbia subject headings:
Europe--Politics and government--1815-1871.
Europe--Politics and government--1871-1918.
Middle class--Europe--History.
Harvard subject headings:
Europe--Politics and government--1815-1871.
Europe--Politics and government--1871-1918.
Middle class--Europe--History.
Princeton subject headings:
Europe--Politics and government--1815-1871.
Europe--Politics and government--1871-1918.
Middle class--Europe--History.