Columbia subject headings:
Amateur theater--Congresses.
Experimental theater--Congresses.
Street theater--Congresses.
Theater and society--Congresses.
Theater--Political aspects--Congresses.
Harvard subject headings:
Amateur theater--Congresses.
Experimental theater--Congresses.
Street theater--Congresses.
Theater and society--Congresses.
Theater--Political aspects--Congresses.
Princeton subject headings:
Amateur theater--Congresses.
Experimental theater--Congresses.
Street theater--Congresses.
Theater and society--Congresses.
Theater--Political aspects--Congresses.