Columbia subject headings:
Harvard subject headings:
Adriatic Coast (Balkan Peninsula)--Antiquities, Roman--Congresses.
Adriatic Coast (Italy)--Antiquities, Roman--Congresses.
Alps, Austrian (Austria)--Antiquities, Roman--Congresses.
Alps--Antiquities, Roman--Congresses.
Danube River Valley--Antiquities, Roman--Congresses.
Excavations (Archaeology)--Danube River Valley--Congresses.
Romans--Danube River Valley--History--Congresses.
Princeton subject headings:
Danube River Valley--Antiquities, Roman.
Excavations (Archaeology)--Danube River Valley.
Romans--Danube River Valley--History.