Columbia subject headings:
Celts--Scotland--History--To 1500.
Middle Ages.
Scotland--History--1057-1603.
Harvard subject headings:
Celts--Scotland--History--To 1500.
Celts--Scotland--History.
Middle Ages
Scotland--History--1057-1603.
Princeton subject headings:
Celts--Scotland--History--To 1500.
Middle Ages.
Scotland--History--1057-1603.