Columbia subject headings:
Ethnology--Northern Ireland--History.
Nationalism--Northern Ireland--History.
Northern Ireland--Politics and government.
Harvard subject headings:
Ireland--History--1922-
Irish unification question.
Nationalism--Ireland--History--20th century
Northern Ireland--History--1968-1998.
Princeton subject headings:
Ethnology--Northern Ireland--History.
Nationalism--Northern Ireland--History.
Northern Ireland--Politics and government.