Columbia subject headings:
Harvard subject headings:
Europe--Kings and rulers.
Germany--Kings and rulers.
Monarchy--Great Britain--History--19th century.
Monarchy--History--19th century.
Nationalism--Europe--History--19th century.
Princeton subject headings:
Europe--Kings and rulers--History--19th century.
Germany--Kings and rulers--History--19th century.
Monarchy--Great Britain--History--19th century.
Monarchy--History--19th century.
Nationalism--Europe--History--19th century.