Columbia subject headings:
Theater architecture--Rome--Congresses.
Theater--Rome--Congresses.
Theaters--Stage-setting and scenery--Rome--Congresses.
Harvard subject headings:
Theater architecture--Rome--Congresses.
Theater--Rome--Congresses.
Theaters--Stage-setting and scenery--Rome--Congresses.
Princeton subject headings:
Theater architecture--Rome--Congresses.
Theater--Rome--Congresses.
Theaters--Stage-setting and scenery--Rome--Congresses.