Columbia subject headings:
Harvard subject headings:
Brochs--Scotland--Shetland.
Excavations (Archaeology)--Scotland--Shetland.
Iron age--Scotland--Shetland.
Shetland (Scotland)--Antiquities.
Princeton subject headings:
Brochs--Scotland--Shetland.
Excavations (Archaeology)--Scotland--Shetland.
Iron age--Scotland--Shetland.
Shetland (Scotland)--Antiquities.