Columbia subject headings:
Harvard subject headings:
Madeira Islands--Economic aspects--19th century.
Madeira Islands--Emigration and immigration--19th century.
Madeira Islands--Foreign relations--Great Britain--19th century.
Madeira Islands--Politics and government--19th century.
Portugal--Foreign relations--Great Britain--19th century.
Princeton subject headings:
Great Britain--Foreign relations--Portugal.
Madeira Islands--Economic conditions--19th century.
Madeira Islands--Emigration and immigration.
Madeira Islands--Politics and government--19th century.
Portugal--Foreign relations--Great Britain.