Columbia subject headings:
Argentina--Emigration and immigration.
Argentina--Social conditions.
Spain--Emigration and immigration.
Spain--Social conditions.
Spaniards--Argentina--History.
Harvard subject headings:
Argentina--Emigration and immigration.
Argentina--Social conditions.
Spain--Emigration and immigration.
Spain--Social conditions.
Spaniards--Argentina--History.
Princeton subject headings:
Argentina--Emigration and immigration.
Argentina--Social conditions.
Spain--Emigration and immigration.
Spain--Social conditions.
Spaniards--Argentina--History.