Columbia subject headings:
Harvard subject headings:
Asylum, Right of--European Union countries
Asylum, Right of--Spain.
European Union countries--Emigration and immigration.
National security--European Union countries
National security--Spain
Refugees--Government policy--European Union countries
Refugees--Government policy--Spain.
Spain--Emigration and immigration.
Princeton subject headings:
European Union countries--Emigration and immigration.
National security--European Union countries.
National security--Spain.
Refugees--Government policy--European Union countries.
Refugees--Government policy--Spain.
Spain--Emigration and immigration.