Columbia subject headings:
Antiquities, Prehistoric--Black Mountains (Wales and England)
Antiquities, Prehistoric--England--Herefordshire.
Antiquities, Prehistoric--Wales--Monmouthshire.
Black Mountains (Wales and England)--Antiquities.
Herefordshire (England)--Antiquities.
Monmouthshire (Wales)--Antiquities.
Harvard subject headings:
Antiquities, Prehistoric--Black Mountains (Wales and England)
Antiquities, Prehistoric--England--Herefordshire.
Antiquities, Prehistoric--Wales--Monmouthshire.
Black Mountains (Wales and England)--Antiquities.
Herefordshire (England)--Antiquities.
Monmouthshire (Wales)--Antiquities.
Princeton subject headings:
Antiquities, Prehistoric--Black Mountains (Wales and England).
Antiquities, Prehistoric--England--Herefordshire.
Antiquities, Prehistoric--Wales--Monmouthshire.
Black Mountains (Wales and England)--Antiquities.
Herefordshire (England)--Antiquities.
Monmouthshire (Wales)--Antiquities.