Columbia subject headings:
Russia--History--Nicholas II, 1894-1917.
Soviet Union--History--Revolution, 1917-1921--Causes.
Soviet Union--History--Revolution, 1917-1921.
World War, 1914-1918--Soviet Union.
Harvard subject headings:
Russia--History--Nicholas II, 1894-1917.
Soviet Union--History--Revolution, 1917-1921--Causes.
Soviet Union--History--Revolution, 1917-1921.
World War, 1914-1918--Russia
Princeton subject headings:
Russia--History--Nicholas II, 1894-1917.
Soviet Union--History--Revolution, 1917-1921--Causes.
Soviet Union--History--Revolution, 1917-1921.
World War, 1914-1918--Russia.