Columbia subject headings:
Theater architecture--Europe--History--19th century--Congresses.
Theater architecture--Europe--History--20th century--Congresses.
Theaters--Stage-setting and scenery--Europe--20th century--Congresses.
Theaters--Stage-setting and scenery--Europe--History--19th century--Congresses.
Harvard subject headings:
Princeton subject headings:
Theater architecture--Europe--History--19th century--Congresses.
Theater architecture--Europe--History--20th century--Congresses.
Theaters--Stage-setting and scenery--Europe--20th century--Congresses.
Theaters--Stage-setting and scenery--Europe--History--19th century--Congresses.