Columbia subject headings:
Ireland--History--1922-
Ireland--Relations--Northern Ireland.
Nineteen sixties.
Northern Ireland--History--1968-1998.
Northern Ireland--Relations--Ireland.
Harvard subject headings:
Ireland--History--1922-
Ireland--Relations--Northern Ireland.
Nineteen sixties.
Northern Ireland--History--1968-1998.
Northern Ireland--Relations--Ireland.
Princeton subject headings:
Ireland--History--1922-