Columbia subject headings:
Arts, German--Germany--Berlin--20th century--Chronology.
Arts, German--Germany--Berlin--20th century--Exhibitions.
Arts, Russian--Russia (Federation)--Moscow--20th century--Chronology.
Arts, Russian--Russia (Federation)--Moscow--20th century--Exhibitions.
Harvard subject headings:
Art, German--20th century--Exhibitions.
Art, Soviet--Exhibitions.
Arts, German--Germany--Berlin--20th century--Chronology.
Arts, German--Germany--Berlin--20th century--Exhibitions.
Arts, Russian--Russia (Federation)--Moscow--20th century--Chronology.
Arts, Russian--Russia (Federation)--Moscow--20th century--Exhibitions.
Princeton subject headings: