Columbia subject headings:
Ireland--History--20th century.
Irish Republican Army--History.
Northern Ireland--History.
Harvard subject headings:
Great Britain--Foreign relations--Ireland.
Great Britain--History, Military--20th century--Fiction.
Ireland--Foreign relations--Great Britain.
Ireland--History--20th century.
Irish Republican Army--History.
Northern Ireland--History.
Terrorism--Great Britain--History--20th century.
Violence--Great Britain--History--20th century.
Princeton subject headings:
Internal security--Great Britain.
Irish Republican Army--History.
Terrorism--Great Britain.
Terrorism--Northern Ireland.