Columbia subject headings:
Harvard subject headings:
Ireland--History--19th century.
Ireland--History--20th century.
Italy--History--19th century.
Italy--History--20th century.
Nationalism--Europe--History--19th century.
Nationalism--Europe--History--20th century
Nationalism--Ireland--History
Nationalism--Italy--History
Nationalism--Spain--History
Spain--History--19th century.
Spain--History--20th century.
Princeton subject headings:
Ireland--History.
Italy--History.
Nationalism--Europe--History.
Spain--History.