Columbia subject headings:
Russia--History--Alexander II, 1855-1881.
Russia--History--Revolution, 1905-1907.
Soviet Union--History--Revolution, 1917-1921.
Harvard subject headings:
Soviet Union--History--Encyclopedias.
Soviet Union--History--Revolution, 1917-1921--Encyclopedias.
Princeton subject headings:
Politicians--Soviet Union--Biography--Dictionaries.
Revolutionaries--Russia--Biography--Dictionaries.
Russia--Biography--Dictionaries.
Soviet Union--Biography--Dictionaries.