Columbia subject headings:
Communism--Soviet Union.
Russia--History--Alexander II, 1855-1881.
Russia--History--Alexander III, 1881-1894.
Russia--History--Nicholas II, 1894-1917.
Soviet Union--History.
Harvard subject headings:
Communism--Soviet Union
Russia--History--1689-1801.
Soviet Union--History.
Princeton subject headings:
Communism--Soviet Union.
Russia--History--Alexander II, 1855-1881.
Russia--History--Alexander III, 1881-1894.
Russia--History--Nicholas II, 1894-1917.
Soviet Union--History.