Columbia subject headings:
Exiles--Spain--History--20th century.
Immigrants--Spain--Social conditions.
Political refugees--Spain--History--20th century.
Harvard subject headings:
Exiles--Spain--History--20th century.
Immigrants--Spain--Social conditions
Political refugees--Spain--History--20th century
Spain--Emigration and immigration--History--20th century.
Princeton subject headings:
Exiles--Spain--History--20th century.
Immigrants--Spain--Social conditions.
Political refugees--Spain--History--20th century.