Columbia subject headings:
Harvard subject headings:
International cooperation--History.
International labor activities--European Union countries--History.
Labor unions--European Union countries--History.
Labor unions--History
Regionalism--European Union countries--History.
Works councils--European Union countries--History.
Works councils--History.
Princeton subject headings:
International cooperation--History.
International labor activities--European Union countries--History.
Labor unions--European Union countries--History.
Labor unions--History.
Regionalism--European Union countries--History.
Works councils--European Union countries--History.
Works councils--History.