Columbia subject headings:
Naples (Italy)--Economic conditions.
Naples (Italy)--Environmental conditions.
Harvard subject headings:
Naples (Italy)--Economic conditions.
Naples (Italy)--Environmental conditions.
Naples (Italy)--History--19th century.
Naples (Italy)--History--20th century.
Princeton subject headings:
Naples (Italy)--Environmental conditions.
Naples (Italy)--History--19th century.
Naples (Italy)--History--20th century.