Columbia subject headings:
History--Philosophy.
Philosophy, Russian--19th century.
Philosophy, Russian--20th century.
Russia--History--Philosophy.
Harvard subject headings:
History--Philosophy
Philosophy, Russian--19th century.
Philosophy, Russian--20th century.
Russia--History--Philosophy.
Princeton subject headings:
History--Philosophy.
Philosophy, Russian--19th century.
Philosophy, Russian--20th century.
Russia--History--Philosophy.