Columbia subject headings:
Excavations (Archaeology)--Italy--Ravenna (Province)--Congresses.
Ravenna (Italy : Province)--Antiquities--Congresses.
Harvard subject headings:
Excavations (Archaeology)--Italy--Ravenna (Province)--Congresses.
Ravenna (Italy : Province)--Antiquities--Congresses.
Princeton subject headings:
Excavations (Archaeology)--Italy--Ravenna (Province)--Congresses.
Ravenna (Italy : Province)--Antiquities--Congresses.