Columbia subject headings:
Europe, Central--Antiquities--Congresses.
Europe, Central--History--Congresses.
Excavations (Archaeology)--Europe, Central--Congresses.
Harvard subject headings:
Europe, Central--Antiquities--Congresses.
Europe, Central--Civilization--Congresses.
Europe, Central--History--Congresses.
Excavations (Archaeology)--Europe, Central--Congresses.
Princeton subject headings:
Europe, Central--History--Congresses.