Columbia subject headings:
Immigrants--Latin America--History.
Latin America--Emigration and immigration--History.
Harvard subject headings:
Mediterranean Region--Emigration and immigration.
North America--Emigration and immigration.
South America--Emigration and immigration.
Princeton subject headings:
Italy--Emigration and immigration--History.
Latin America--Emigration and immigration--History.
Portugal--Emigration and immigration--History.
Spain--Emigration and immigration--History.