Columbia subject headings:
Brough of Birsay (Orkney)--Antiquities.
Excavations (Archaeology)--Scotland--Brough of Birsay (Orkney)
Northmen--Antiquities.
Orkney (Scotland)--Antiquities.
Picts--Antiquities.
Scotland--Antiquities.
Harvard subject headings:
Brough of Birsay (Scotland)--Antiquities.
Excavations (Archaeology)--Scotland--Brough of Birsay.
Northmen--Scotland--Brough of Birsay--Antiquities.
Scotland--Antiquities.
Princeton subject headings:
Brough of Birsay (Scotland)--Antiquities.
Excavations (Archaeology)--Orkney--Brough of Birsay.
Northmen--Antiquities.
Orkney (Scotland)--Antiquities.
Picts--Antiquities.
Scotland--Antiquities.