Columbia subject headings:
Great Britain--History--1789-1820.
Ireland--History--1760-1820.
Harvard subject headings:
Castlereagh, Robert Stewart, Viscount, 1769-1822
Great Britain--History--1789-1829.
Ireland--History--1760-1820
Princeton subject headings:
Great Britain--History--1789-1820.
Ireland--History--1760-1820.