Columbia subject headings:
Emigration and immigration.
Europe--Emigration and immigration.
Globalization.
Harvard subject headings:
Emigration and immigration--Economic aspects
Emigration and immigration--Government policy
Emigration and immigration--Political aspects
Emigration and immigration--Social aspects
Germany--Emigration and immigration--Government policy.
International cooperation
Refugees--Government policy
Refugees--Government policy--Germany.
Princeton subject headings:
Emigration and immigration--Political aspects.
European Union countries--Emigration and immigration--Government policy.
Refugees--Europe.
Refugees--Government policy--European Union countries.