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