Columbia subject headings:
Blackwell, Joseph Andrew, 1798-1886.
Great Britain--Foreign relations--1837-1901.
Great Britain--Foreign relations--Hungary.
Hungary--Foreign relations--Great Britain.
Hungary--Politics and government--19th century.
Harvard subject headings:
Blackwell, Joseph Andrew, 1798-1886.
Great Britain--Foreign relations--1837-1901.
Great Britain--Foreign relations--Hungary.
Hungary--Foreign relations--Great Britain.
Hungary--Politics and government--19th century
Princeton subject headings:
Blackwell, Joseph Andrew, 1798-1886.
Diplomats--Great Britain--Biography.