Columbia subject headings:
Danube River Valley--Antiquities--Congresses.
Neolithic period--Danube River Valley--Congresses.
Harvard subject headings:
Danube River Valley--Antiquities--Congresses.
Excavations (Archaeology)--Danube River Valley--Congresses.
Neolithic period--Danube River Valley--Congresses.
Princeton subject headings:
Danube River Valley--Antiquities--Congresses.
Excavations (Archaeology)--Danube River Valley--Congresses.
Neolithic period--Danube River Valley--Congresses.