Columbia subject headings:
Great Britain--Relations--Ireland.
Irish unification question.
Northern Ireland--Foreign relations.
Northern Ireland--Politics and government--1968-1998.
Ulster (Northern Ireland and Ireland)--Politics and government.
Harvard subject headings:
Irish unification question.
Northern Ireland--Politics and government.
Princeton subject headings:
Great Britain--Relations--Ireland.
Irish reunification question.
Northern Ireland--Foreign relations.
Northern Ireland--Politics and government--1968-1998.
Ulster (Northern Ireland and Ireland)--Politics and government.