Columbia subject headings:
Archaeoastronomy--Wales--Dyfed.
Dyfed (Wales)--Antiquities.
Megalithic monuments--Wales--Dyfed.
Harvard subject headings:
Archaeoastronomy--Wales--Dyfed.
Dyfed (Wales)--Antiquities.
Megalithic monuments--Wales--Dyfed.
Wales--Antiquities.
Princeton subject headings:
Archaeoastronomy--Wales--Dyfed.
Dyfed--Antiquities.
Megalithic monuments--Wales--Dyfed.