Columbia subject headings:
Harvard subject headings:
Great Britain--Social conditions--19th century.
Great Britain--Social conditions--20th century.
Irish--England--History--19th century.
Irish--England--History--20th century.
Irish--Scotland--History--History--19th century.
Irish--Scotland--History--History--20th century.
Princeton subject headings:
Irish--England--History--19th century.
Irish--England--History--20th century.
Irish--Scotland--History--19th century.
Irish--Scotland--History--20th century.