Columbia subject headings:
Italian drama--History and criticism--Congresses.
Italy--History--1849-1870--Drama--Congresses.
Theater--Italy--History--19th century--Congresses.
Harvard subject headings:
Italian drama--19th century--History and criticism--Congresses.
Italy--History--1849-1870--Congresses.
Theater--Italy--History--19th century--Congresses.
Princeton subject headings: