Columbia subject headings:
Harvard subject headings:
Europe, Central--History--Congresses.
Europe, Eastern--History--Congresses.
Identity (Philosophical concept)--Congresses.
Regionalism--Europe, Central--History--Congresses.
Regionalism--Europe, Eastern--History--Congresses.
Princeton subject headings:
Europe, Central--History.
Europe, Eastern--History.
Identity (Philosophical concept)--Congresses.
Regionalism--Europe, Central--Congresses.
Regionalism--Europe, Eastern--Congresses.