Columbia subject headings:
Revolutionaries--Soviet Union.
Soviet Union--Intellectual life.
Soviet Union--Religion.
Harvard subject headings:
Revolutionaries--Soviet Union
Russia--History--1801-1917.
Soviet Union--History.
Soviet Union--Intellectual life.
Soviet Union--Religion.
Princeton subject headings:
Russia--History--1801-1917.
Russia--Politics and government--1801-1917.
Soviet Union--History.
Soviet Union--Politics and government.