Columbia subject headings:
Architecture--Russia (Federation)--History.
Art historians--Czech Republic--Prague--Biography.
Art, Byzantine--History.
Art, Russian--History.
Art--Balkan Peninsula--History.
Okunev, Nikolaĭ Lʹvovich, 1885-1949.
Harvard subject headings:
Art criticism.
Art historians--Soviet Union--Biography.
Art, Russian--History.
Art--History
Okunev, Nikolaĭ Lʹvovich, 1885-1949.
Princeton subject headings: