Columbia subject headings:
Harvard subject headings:
Britons.
Fortification--England--Somerset.
Iron age--England--Somerset.
Somerset (England)--Antiquities, Celtic.
Princeton subject headings:
Earthworks (Archaeology)
England--Antiquities, Roman.
England--Antiquities.
Excavations (Archaeology)--England--Somerset.
Fortification, Roman--England--Somerset.
Fortification--England--Somerset.
Somerset--Antiquities, Roman.
Somerset--Antiquities.