Columbia subject headings:
Harvard subject headings:
Art, German--Germany--Berlin--20th century.
Art--Political aspects--Germany--Berlin--History--20th century.
Berlin Wall, Berlin, Germany, 1961-1989
Graffiti--Germany--Berlin--History--20th century.
Street art--Germany--Berlin--History--20th century.
Princeton subject headings:
Art, German--Germany--Berlin--20th century.
Berlin Wall, Berlin, Germany, 1961-1989.
Graffiti--Germany--Berlin--History--20th century.