Columbia subject headings:
Harvard subject headings:
Etruscans--Italy--Spina (Extinct city)--Congresses.
Excavations (Archaeology)--Italy--Po River Valley--Congresses.
Greeks--Italy--Spina (Extinct city)--Congresses.
Po River Valley (Italy)--Antiquities--Congresses.
Spina (Extinct city)--Congresses.
Princeton subject headings:
Excavations (Archaeology)--Italy--Spina (Extinct city)--Congresses.
Spina (Extinct city)--Antiquities--Congresses.