Columbia subject headings:
Northern Ireland--History--1968-1998.
Ulster (Northern Ireland and Ireland)--History.
Harvard subject headings:
Northern Ireland--History--1968-1998.
Northern Ireland--History.
Ulster (Northern Ireland and Ireland)--History.
Princeton subject headings:
Northern Ireland--History--1968-1998.
Northern Ireland--History--1998-
Ulster (Northern Ireland and Ireland)--History.