Columbia subject headings:
Northern Ireland--History--20th century.
Northern Ireland--Politics and government.
O'Neill, Terence, 1914-1990.
Harvard subject headings:
Northern Ireland--History--20th century.
Northern Ireland--Politics and government.
O'Neill, Terence, 1914-1990.
Princeton subject headings:
Northern Ireland--History--20th century.
Northern Ireland--Politics and government.
O'Neill, Terence, 1914-1990.