Columbia subject headings:
Perugia (Italy)--History.
Trasimeno, Lake (Italy)--History.
Trasimeno, Lake, Region (Italy)--History.
Harvard subject headings:
Perugia (Italy)--Economic conditions.
Perugia (Italy)--History--To 1500.
Perugia (Italy)--History.
Trasimeno, Lake (Italy)--Economic conditions.
Trasimeno, Lake (Italy)--History.
Trasimeno, Lake, Region (Italy)--History--To 1500.
Princeton subject headings:
Perugia (Italy)--History.
Trasimeno, Lake (Italy)--History.
Trasimeno, Lake, Region (Italy)--History.