Columbia subject headings:
Archaeology and history--Europe.
Archaeology, Medieval--Europe.
Charlemagne, Emperor, 742-814.
Cities and towns, Medieval--Europe--History.
Europe--Commerce--History--To 1500.
Europe--Economic conditions--To 1492.
Harvard subject headings:
Archaeology and history--Europe.
Cities and towns, Medieval--Europe--History.
Europe--Commerce--History.
Europe--Economic conditions--To 1492.
Princeton subject headings:
Archaeology and history--Europe.
Cities and towns, Medieval--Europe--History.
Europe--Commerce--History.
Europe--Economic conditions--To 1492.