Columbia subject headings:
Italy, Southern--Commerce.
Italy, Southern--Economic conditions.
Naples (Kingdom)--Commerce.
Naples (Kingdom)--Economic conditions.
Harvard subject headings:
Commerce--History--Medieval, 500-1500
Italy, Southern--Commerce.
Italy, Southern--Economic conditions.
Naples (Kingdom)--Commerce.
Naples (Kingdom)--Economic conditions.
Princeton subject headings:
Italy, Southern--Commerce.
Italy, Southern--Economic conditions.
Naples (Kingdom)--Commerce.
Naples (Kingdom)--Economic conditions.