Columbia subject headings:
Harvard subject headings:
British--Ireland--History--19th century.
British--Ireland--History--20th century.
Ireland--Politics and government--19th century.
Irish question.
Princeton subject headings:
British--Ireland--History--19th century.
British--Ireland--History--20th century.
Ireland--History--19th century.
Ireland--History--20th century.
Ireland--Politics and government--19th century.
Ireland--Politics and government--20th century.
Irish question.