Columbia subject headings:
Harvard subject headings:
Europe--Emigration and immigration--Government policy--Congresses.
Immigrants--Government policy--Europe--Congresses.
Multiculturalism--Europe--Congresses
Social integration--Europe--Congresses.
Princeton subject headings:
Europe--Emigration and immigration--Government policy--Congresses.
Immigrants--Cultural assimilation--Europe--Congresses.
Multiculturalism--Europe--Congresses.
Social integration--Europe--Congresses.