Columbia subject headings:
Harvard subject headings:
Revolutionaries--Soviet Union
Revolutions--Soviet Union--History--19th century.
Russia--Intellectual life--1801-1917.
Socialism--Soviet Union--History--19th century.
Princeton subject headings:
Philosophy, Russian--19th century.
Revolutionaries--Russia.
Russia--Intellectual life--1801-1917.
Russia--Politics and government.
Russia--Social conditions.