Columbia subject headings:
Civilization, Medieval.
Europe--Social conditions--To 1492.
Middle Ages.
Schmid, Karl, 1923-1993.
Harvard subject headings:
Civilization, Medieval.
Europe--Social conditions--To 1492.
Middle Ages.
Schmid, Karl, 1923-1993
Princeton subject headings:
Civilization, Medieval.
Europe--Social conditions--To 1492.
Middle Ages.
Schmid, Karl, 1923-