Columbia subject headings:
Harvard subject headings:
Bologna (Italy)--History
Bologna (Italy)--History--To 1506
Tuscany (Italy)--History.
Visconti, Giovanni, 1290-1354.
Visconti, Giovanni, Archbishop of Milan, 1290-1354.
Princeton subject headings:
Bologna (Italy)--History.
Tuscany (Italy)--History.
Visconti, Giovanni, 1290-1354.