Columbia subject headings:
Austria--Relations--Italy--Naples (Kingdom)
Naples (Kingdom)--Relations--Austria.
Naples (Kingdom)--Relations--Turkey.
Postal service--Italy--Naples (Kingdom)--History--18th century.
Postal service--Turkey--Istanbul--History--18th century.
Turkey--Relations--Italy--Naples (Kingdom)
Harvard subject headings:
Austria--Relations--Italy--Naples (Kingdom)
Austria--Relations--Naples (Kingdom)
Naples (Kingdom)--Relations--Austria.
Naples (Kingdom)--Relations--Turkey.
Postal service--Italy--Naples (Kingdom)--History--18th century.
Postal service--Turkey--History--18th century.
Postal service--Turkey--Istambul--History--18th century.
Postal service--Turkey--Istanbul--History--18th century.
Turkey--Relations--Italy--Naples (Kingdom)
Turkey--Relations--Naples (Kingdom)
Princeton subject headings:
Postal service--Italy--Naples (Kingdom)--History--18th century.
Postal service--Turkey--History--18th century.