Columbia subject headings:
Finance--Italy--Rome--History.
Octroi--Italy--Rome--History.
Taxation--Italy--Rome--History.
Harvard subject headings:
Finance--Italy--Rome--History.
Octroi--Italy--Rome--History.
Taxation--Italy--Rome--History.
Princeton subject headings:
Finance--Italy--Rome--History.
Octroi--Italy--Rome--History.
Taxation--Italy--Rome--History.