Columbia subject headings:
Arts, German--Germany--Berlin--Exhibitions.
Berlin (Germany)--Social conditions--Exhibitions.
Labor unions--Germany--Berlin--Exhibitions.
Working class--Germany--Berlin--Exhibitions.
Harvard subject headings:
Berlin (Germany)--Economic conditions--Exhibitions.
Berlin (Germany)--History--Exhibitions.
Berlin (Germany)--Social conditions--Exhibitions.
Working class--Germany--Berlin--History--Exhibitions.
Princeton subject headings:
Arts--Germany--Berlin--Exhibitions.
Berlin (Germany)--Social conditions--Exhibitions.
Labor unions--Germany--Berlin--Exhibitions.
Working class--Germany--Berlin--Exhibitions.