Columbia subject headings:
Emigration and immigration law--Spain.
Spain--Emigration and immigration--Economic aspects.
Spain--Emigration and immigration--Social aspects.
Harvard subject headings:
Emigration and immigration law--Spain.
Spain--Emigration and immigration--Economic aspects.
Spain--Emigration and immigration--Social aspects.
Spain--Emigration and immigration--Sociological aspects.
Princeton subject headings:
Emigration and immigration law--Spain.
Spain--Emigration and immigration--Economic aspects.
Spain--Emigration and immigration--Social aspects.