Columbia subject headings:
Philosophy, Russian--History.
Russia--History--1801-1917.
Russia--History--20th century.
Russia--Intellectual life--1801-1917.
Russia--Intellectual life--20th century.
Harvard subject headings:
Philosophy, Russian--History.
Russia--History--1801-1917.
Russia--Intellectual life--1801-1917.
Russia--Intellectual life--20th century.
Soviet Union--History.
Princeton subject headings:
Philosophy, Russian--19th century.
Philosophy, Russian--20th century.
Russia--Intellectual life.