Columbia subject headings:
Constitutional law--Northern Ireland--Sources.
Great Britain--Foreign relations--Ireland.
Ireland--Foreign relations--Great Britain.
Harvard subject headings:
Anglo-Irish Agreement
Great Britain--Foreign relations--Ireland.
Ireland--Foreign relations--Great Britain.
Northern Ireland--Politics and government--1968-1998.
Princeton subject headings:
Constitutional law--Northern Ireland--Sources.
Great Britain--Foreign relations--Ireland.
Ireland--Foreign relations--Great Britain.