Columbia subject headings:
Harvard subject headings:
Europe--Emigration and immigration--Government policy.
Europe--Emigration and immigration.
European Agency for the Management of Operational Cooperation at the External Borders of the Member States of the European Union.
European Union countries--Boundaries.
European Union countries--Emigration and immigration--Government policy.
European Union countries--Emigration and immigration.
Germany--Emigration and immigration.
Immigrants--Government policy--Europe.
Social integration--Europe.
Social integration--European Union countries.
United States--Emigration and immigration.
Princeton subject headings:
Europe--Emigration and immigration--Government policy.
Europe--Emigration and immigration.
Immigrants--Government policy--Europe.
Social integration--Europe.