Columbia subject headings:
Harvard subject headings:
Great Britain--Foreign relations--Portugal.
Palmerston, Henry John Temple, Viscount, 1784-1865.
Portugal--Foreign relations--Great Britain.
Slave trade
Princeton subject headings:
Great Britain--Foreign relations--Portugal.
Palmerston, Henry John Temple, Viscount, 1784-1865.
Portugal--Foreign relations--Great Britain.
Slave trade.