Columbia subject headings:
Celts--Ireland--History.
Ireland--Antiquities, Celtic.
Harvard subject headings:
Celts--Ireland
Celts--Ireland--History.
Fortification, Prehistoric--Ireland
Ireland--Antiquities, Celtic.
Ireland--Antiquities, Roman.
Iron age--Ireland.
La Tène period
Paganism--Ireland.
Readers (Publications)
Romans--Ireland.
Princeton subject headings:
Celts--Ireland--History.
Ireland--Antiquities, Celtic.