Columbia subject headings:
Harvard subject headings:
Great Britain--Politics and government--1964-1979.
Great Britain--Politics and government--1979-1997.
Northern Ireland--Politics and government--1968-1998.
Violence--Northern Ireland
Princeton subject headings:
Great Britain--Politics and government--1964-1979.
Great Britain--Politics and government--1979-1997.
Northern Ireland--Politics and government--1968-1998.