Columbia subject headings:
Great Britain--Foreign relations--Ireland.
Great Britain. Treaties, etc. 1998 April 10.
Ireland--Foreign relations--Great Britain.
Ireland--Foreign relations--Northern Ireland.
Northern Ireland--Foreign relations--Ireland.
Harvard subject headings:
Constitutional law--Northern Ireland.
Great Britain--Foreign relations--Ireland.
Great Britain. Treaties, etc. 1998 April 10.
Ireland--Foreign relations--Great Britain.
Ireland--Foreign relations--Northern Ireland.
Northern Ireland--Foreign relations--Ireland.
Northern Ireland--Politics and government--1998-.
Northern Ireland--Relations--Great Britain.
Northern Ireland--Relations--Ireland.
Princeton subject headings:
Constitutional law--Northern Ireland.
Great Britain. Treaties, etc. 1998 April 10
Northern Ireland--Politics and government--1998-
Northern Ireland--Relations--Great Britain.
Northern Ireland--Relations--Ireland.