Columbia subject headings:
Excavations (Archaeology)--Scotland--Orkney.
Orkney (Scotland)--Antiquities.
Harvard subject headings:
Orkney (Scotland)--Antiquities.
Orkney (Scotland)--History.
Prehistoric peoples--Scotland--Orkney.
Scotland--Antiquities.
Princeton subject headings:
Excavations (Archaeology)--Scotland--Orkney.
Orkney (Scotland)--Antiquities.
Prehistoric peoples--Scotland--Orkney.
Scotland--Antiquities.