Columbia subject headings:
Harvard subject headings:
Centuriation (Surveying)--Italy--Romagna.
Excavations (Archaeology)--Italy--Romagna.
Romagna (Italy)--Antiquities, Roman.
Princeton subject headings:
Centuriation (Surveying)--Italy--Romagna.
Land use--Italy--Romagna--History.
Romagna (Italy)--Antiquities, Roman.