Columbia subject headings:
Economic history--Medieval, 500-1500.
Europe--Commerce--Islamic Empire.
Islamic Empire--Commerce--Europe.
Islamic Empire--Economic conditions.
Harvard subject headings:
Economic history--Medieval, 500-1500
Europe--Commerce--Islamic Empire.
Islamic Empire--Commerce--Europe.
Islamic Empire--Economic conditions.
Princeton subject headings:
Economic history--Medieval, 500-1500.
Europe--Commerce--Islamic Empire.
Islamic Empire--Commerce--Europe.
Islamic Empire--Economic conditions.