Columbia subject headings:
Fortification--Great Britain.
Great Britain--Antiquities, Roman.
Land settlement--Great Britain.
Romans--Great Britain.
Harvard subject headings:
Fortification--Great Britain.
Great Britain--Antiquities, Roman.
Land settlement--Great Britain.
Romans--Great Britain
Princeton subject headings:
Fortification--Great Britain.
Great Britain--Antiquities, Roman.
Land settlement--Great Britain.
Romans--Great Britain.