Columbia subject headings:
Ireland--Politics and government--20th century.
Ireland--Relations--Northern Ireland.
Northern Ireland--Politics and government--20th century.
Northern Ireland--Relations--Ireland.
Unionism (Irish politics)--History--20th century.
Harvard subject headings:
Ireland--Politics and government--1949-
Ireland--Relations--Northern Ireland.
Northern Ireland--Politics and government--1968-1998.
Northern Ireland--Relations--Ireland.
Unionism (Irish politics)--History--20th century.
Princeton subject headings:
Ireland--Politics and government--1949-
Ireland--Relations--Northern Ireland.
Northern Ireland--Politics and government--1968-1998.
Northern Ireland--Relations--Ireland.
Unionism (Irish politics)--History--20th century.