Columbia subject headings:
Harvard subject headings:
Europe--Economic conditions--Congresses.
Europe--Economic integration--Congresses.
Europe--Emigration and immigration--Economic aspects--Congresses.
Europe--Emigration and immigration--Social aspects--Congresses.
Europe--Social conditions--Congresses.
Racism--Europe--Congresses.
Princeton subject headings:
Europe--Economic conditions--Congresses.
Europe--Economic integration--Congresses.
Europe--Emigration and immigration--Economic aspects--Congresses.
Europe--Emigration and immigration--Social aspects--Congresses.
Europe--Social conditions--Congresses.
Racism--Europe--Congresses.