Columbia subject headings:
Harvard subject headings:
Migration, Internal--Spain--Statistics--Periodicals.
Noncitizens--Spain--Statistics--Periodicals.
Spain--Emigration and immigration--Statistics--Periodicals.
Princeton subject headings:
Migration, Internal--Spain--Statistics--Periodicals.
Noncitizens--Spain--Statistics--Periodicals.
Periodicals.
Spain--Emigration and immigration--Statistics--Periodicals.
Statistics.