Columbia subject headings:
Ethnicity--Europe--Congresses.
Europe--Emigration and immigration--Congresses.
Multiculturalism--Europe--Congresses.
Nationalism--Europe--Congresses.
Harvard subject headings:
Ethnicity--Europe--Congresses.
Europe--Emigration and immigration--Congresses.
Multiculturalism--Europe--Congresses
Nationalism--Europe--Congresses
Princeton subject headings:
Europe--Emigration and immigration--Congresses.
Multiculturalism--Europe--Congresses.
Nationalism--Europe--Congresses.