Columbia subject headings:
Megalithic monuments--France--Brittany.
Megalithic monuments--Great Britain.
Megalithic monuments--Ireland.
Megalithic monuments.
Menhirs--Europe.
Prehistoric peoples--Europe--Calendars.
Harvard subject headings:
Archaeoastronomy--Europe.
Europe--Antiquities.
Leys--Europe.
Megalithic monuments--Europe
Megalithic monuments--France--Brittany.
Megalithic monuments--Great Britain
Megalithic monuments--Ireland
Menhirs--Europe.
Menhirs--France--Brittany.
Menhirs--Great Britain.
Menhirs--Ireland.
Prehistoric peoples--Europe--Calendars.
Princeton subject headings:
Megalithic monuments--France--Brittany.
Megalithic monuments--Great Britain.
Megalithic monuments--Ireland.
Menhirs--Europe.
Prehistoric peoples--Europe.