Columbia subject headings:
Europe--Antiquities.
Excavations (Archaeology)--Europe--Congresses.
Inclosures--Europe.
Harvard subject headings:
Europe--Antiquities--Congresses
Fortification, Prehistoric--Europe--Congresses.
Fortification, Prehistoric--Europe.
Human settlements--Europe.
Neolithic period--Europe
Neolithic period--Europe--Congresses.
Prehistoric peoples--Europe
Princeton subject headings:
Europe--Antiquities.
Excavations (Archaeology)--Europe--Congresses.
Inclosures--Europe.