Columbia subject headings:
Entertainers--Germany--Westphalia--History--Exhibitions.
Music-halls (Variety-theaters, cabarets, etc.)--Germany--Westphalia--History--Exhibitions.
Harvard subject headings:
Entertainers--Germany--Westphalia--Biography--Exhibitions.
Music-halls (Variety-theaters, cabarets, etc.)--Germany--Westphalia--History--19th century--Exhibitions.
Music-halls (Variety-theaters, cabarets, etc.)--Germany--Westphalia--History--20th century--Exhibitions.
Princeton subject headings:
Entertainers--Germany--Westphalia--History--Exhibitions.
Music-halls (Variety-theaters, cabarets, etc.)--Germany--Westphalia--History--Exhibitions.