Columbia subject headings:
Harvard subject headings:
America--Economic integration--Social aspects--Congresses.
European Union countries--Economic integration--Social aspects--Congresses.
Foreign trade and employment--America--Congresses.
Foreign trade and employment--European Union countries--Congresses.
Princeton subject headings:
America--Economic integration--Social aspects--Congresses.
European Union countries--Economic integration--Social aspects--Congresses.
Foreign trade and employment--America--Congresses.
Foreign trade and employment--European Union countries--Congresses.