Columbia subject headings:
Immigrants--Social conditions--Spain--Social conditions.
Spain--Emigration and immigration--History--21st century.
Spaniards--Foreign countries--History--21st century.
Harvard subject headings:
Immigrants--Spain--Social conditions
Spain--Emigration and immigration--History--21st century.
Spaniards--Foreign countries--History--21st century.
Princeton subject headings:
Immigrants--Social conditions.
Spain--Economic conditions--21st century.
Spain--Emigration and immigration--History--21st century.
Spaniards--Foreign countries--History--21st century.