Columbia subject headings:
Excavations (Archaeology)--Wales.
Usk (Wales)--Antiquities.
Harvard subject headings:
Excavations (Archaeology)--Wales
Fortification, Roman--Wales--Usk (Gwent)
Romans--Wales--Usk (Gwent)
Usk (Wales)--Antiquities, Roman.
Usk (Wales)--Antiquities.
Princeton subject headings:
Fortification, Roman--Wales--Usk.
Great Britain--History, Military--55 B.C.-449 A.D.
Romans--Wales--Usk.
Usk (Wales)--Antiquities, Roman.
Wales--Antiquities, Roman.