Columbia subject headings:
Europe--Economic integration--History--19th century.
Europe--Politics and government--19th century.
European federation--History--19th century.
National characteristics, European.
Harvard subject headings:
Europe--Economic conditions--19th century.
Europe--History--1789-1900.
Europe--Politics and government--19th century.
Princeton subject headings:
Europe--Economic integration--History--19th century.
Europe--Politics and government--19th century.
European federation--History--19th century.
National characteristics, European.