Columbia subject headings:
Emigration and immigration law--Europe.
Europe--Emigration and immigration--Government policy.
European Union countries--Emigration and immigration--Government policy.
European Union.
Harvard subject headings:
Emigration and immigration law--Europe.
Europe--Emigration and immigration--Government policy.
European Union
European Union countries--Emigration and immigration--Government policy.
Princeton subject headings:
Emigration and immigration law--Europe.
Europe--Emigration and immigration--Government policy.
European Union countries--Emigration and immigration--Government policy.
European Union.