Columbia subject headings:
Civilization, Medieval.
Hughes, Kathleen, 1926-1977.
Ireland--Civilization--To 1172.
Harvard subject headings:
Civilization, Medieval.
Hughes, Kathleen, 1927?-1977.
Ireland--Civilization--To 1172.
Princeton subject headings:
Civilization, Medieval.
Hughes, Kathleen.
Ireland--Civilization--To 1172.