Columbia subject headings:
Harvard subject headings:
Constitutional history--Europe--Congresses.
Constitutional history--European Union countries--Congresses.
European federation--History--Congresses.
Federal government--Europe--History--Congresses.
Federal government--European Union countries--Congresses.
Princeton subject headings:
Constitutional history--European Union countries--Congresses.
Constitutional history--Germany--Congresses.
Constitutional history--Switzerland--Congresses.
Constitutional history--United States--Congresses.
European Union--Congresses.
European federation--Congresses.