Columbia subject headings:
Antiquities, Prehistoric--Europe.
Megalithic monuments--Europe.
Paleolithic period--Europe.
Petroglyphs--Europe, Southern.
Religion, Prehistoric--Europe.
Signs and symbols--Europe.
Harvard subject headings:
Antiquities, Prehistoric--Europe
Megalithic monuments--Europe
Paleolithic period--Europe.
Petroglyphs--Europe.
Religion, Prehistoric--Europe.
Signs and symbols--Europe.
Princeton subject headings: