Columbia subject headings:
Harvard subject headings:
Antiquities, Prehistoric--Europe, Central.
Antiquities, Prehistoric--Europe, Western.
Europe, Central--Antiquities.
Europe, Central--Boundaries.
Europe, Western--Antiquities.
Europe, Western--Boundaries.
Fortification, Prehistoric--Europe, Central.
Fortification, Prehistoric--Europe, Western.
Iron age--Europe, Central.
Iron age--Europe, Western.
Princeton subject headings:
Antiquities, Prehistoric--Europe, Central.
Antiquities, Prehistoric--Europe, Western.
Europe, Central--Boundaries.
Europe, Western--Boundaries.
Fortification, Prehistoric--Europe, Central.
Fortification, Prehistoric--Europe, Western.
Iron age--Europe, Central.
Iron age--Europe, Western.