Columbia subject headings:
Great Britain--Foreign relations--Portugal.
Portugal--Foreign relations--18th century.
Portugal--Foreign relations--Great Britain.
Portugal--History--John V, 1706-1750.
Portugal--History--Joseph, 1750-1777.
Portugal--History--Maria I, 1777-1816.
Harvard subject headings:
Great Britain--Foreign relations--Portugal.
Portugal--Foreign relations--18th century.
Portugal--Foreign relations--Great Britain.
Portugal--History--John V, 1706-1750.
Portugal--History--Joseph, 1750-1777.
Portugal--History--Maria I, 1777-1816.
Princeton subject headings:
Portugal--History--John V, 1706-1750.
Portugal--History--Joseph, 1750-1777.
Portugal--History--Maria I, 1777-1816.