Columbia subject headings:
Constitutional history--Ireland.
Constitutional history--Northern Ireland.
Ireland--Politics and government--1922-
Irish unification question.
Northern Ireland--Politics and government--20th century.
Harvard subject headings:
Constitutional history--Ireland
Constitutional history--Northern Ireland.
Ireland--Politics and government--1922-
Irish unification question.
Northern Ireland--Politics and government--20th century.
Princeton subject headings:
Ireland--Politics and government--1922-
Irish unification question.
Northern Ireland--Politics and government--1922-.