Columbia subject headings:
Harvard subject headings:
Art galleries, Commercial--Germany--Berlin--History--20th century.
Art--Collectors and collecting--Germany--Berlin--History--20th century.
Art--Economic aspects--Germany--Berlin--History--20th century.
Law and art--Germany (East)
Princeton subject headings:
Art galleries, Commercial--Germany--Berlin--History--20th century.
Art--Collectors and collecting--Germany--Berlin--History--20th century.
Art--Economic aspects--Germany--Berlin--History--20th century.
Law and art--Germany (East).