Columbia subject headings:
Serfdom--Europe--History.
Slavery--Europe--History.
Social history--Medieval, 500-1500.
Harvard subject headings:
France--Social conditions--987-1515.
France--Social conditions--To 987.
Serfdom--Europe--History.
Slavery--Europe--History.
Social history--Medieval, 500-1500
Spain--Social conditions--To 1800.
Princeton subject headings:
Serfdom--Europe--History.
Slavery--Europe--History.
Social history--Medieval, 500-1500.