Columbia subject headings:
Harvard subject headings:
Algarve (Portugal)--Emigration.
Andalusia (Spain)--Emigration and immigration.
Emigration and immigration--History--19th century.
Emigration and immigration--History--20th century.
Gibraltar--Emigration and immigration--History.
Princeton subject headings:
Algarve (Portugal)--Emigration and immigration--History.
Andalusia (Spain)--Emigration and immigration--History.
Gibraltar--Emigration and immigration--History.
Portugal--Emigration and immigration--History.