Columbia subject headings:
Harvard subject headings:
Europe--Economic conditions--Congresses.
United States--Economic conditions--Congresses.
Princeton subject headings:
European Union countries--Economic conditions--Congresses.
Labor supply--European Union countries--Congresses.
Labor supply--North America--Congresses.
North America--Economic conditions--Congresses.
Unemployment--European Union countries--Congresses.
Unemployment--North America--Congresses.