Columbia subject headings:
Guilds--Europe--History.
Middle Ages.
Social security--Europe--History.
Harvard subject headings:
Guilds--Europe--History--To 1500.
Guilds--Europe--History.
Insurance--Europe--History--To 1500.
Middle Ages.
Social security--Europe--History.
Princeton subject headings:
Guilds--Europe--History.
Middle Ages.
Social security--Europe--History.