Columbia subject headings:
Great Britain. Army--History--20th century.
Northern Ireland--History--1968-1998.
Harvard subject headings:
Great Britain. Army--History--20th century.
Irish Republican Army--History--20th century.
Northern Ireland--History--1968-1998.
Northern Ireland--History--1998-.
Political violence--Northern Ireland--History--20th century
Princeton subject headings:
Great Britain. Army--History--20th century.
Irish Republican Army--History--20th century.
Northern Ireland--History--1968-1998.
Northern Ireland--History--1998-
Political violence--Northern Ireland--History--20th century.