Columbia subject headings:
Harvard subject headings:
Council of Europe--History.
European Coal and Steel Community--History.
European Free Trade Association--History.
European communities--History.
International agencies--Europe
Nordic Council--History.
North Atlantic Treaty Organization--History.
Organisation for Economic Co-operation and Development--History.
Organisation for European Economic Co-operation--History.
Western European Union--History.
Princeton subject headings:
European communities.
European federation.
International organization.