Columbia subject headings:
Harvard subject headings:
Ireland--History--20th century.
Irish Republican Army.
Northern Ireland--History--20th century.
Political violence--Ireland--History--20th century--Biography.
Political violence--Northern Ireland--History--20th century--Biography.
Ulster Defence Association.
Princeton subject headings:
Ervine, David.
Hughes, Brendan.
Ireland--History--20th century.
Northern Ireland--History--20th century.
Political violence--Ireland--History--20th century--Biography.
Political violence--Northern Ireland--History--20th century--Biography.