Columbia subject headings:
Russia--History--1801-1917--Philosophy.
Russia--Intellectual life--1801-1917.
Russia--Social conditions--1801-1917.
Soviet Union--History--Philosophy.
Soviet Union--Social conditions.
Harvard subject headings:
Russia--History--1801-1917--Philosophy.
Russia--Intellectual life--1801-1917.
Russia--Social conditions--1801-1917.
Soviet Union--History--Philosophy.
Soviet Union--Social conditions.
Princeton subject headings: