Columbia subject headings:
Harvard subject headings:
Alba (Kingdom)--History.
America--Discovery and exploration--Pre-Columbian.
Canada--Antiquities.
Canada--Discovery and exploration--Scottish.
Navigation, Prehistoric.
Prehistoric peoples--Canada.
Prehistoric peoples--Scotland.
Voyages and travels
Princeton subject headings:
Alba (Kingdom)
America--Discovery and exploration--Pre-Columbian.
Celts--Scotland--History--To 1500.
Civilization, Celtic.
Scotland--History--1057-1603.