Columbia subject headings:
Europe--Civilization.
Europe--History, Military.
Europe--History--To 476.
Excavations (Archaeology)--Europe.
Fortification, Roman--Europe.
Frontiers of the Roman Empire World Heritage Site.
Romans--Europe.
World Heritage areas--Europe.
Harvard subject headings:
Europe--Civilization
Europe--History, Military
Europe--History--To 476
Excavations (Archaeology)--Europe
Fortification, Roman--Europe.
Frontiers of the Roman Empire World Heritage Site
Romans--Europe
World Heritage areas--Europe.
Princeton subject headings: