Columbia subject headings:
Soviet Union--History--Revolution, 1917-1921--Participation, German.
Harvard subject headings:
Soviet Union--History--Revolution, 1917-1921--Campaigns.
Soviet Union. Raboche-Krestʹi︠a︡nskai︠a︡ Krasnai︠a︡ Armii︠a︡--History.
Princeton subject headings:
Soviet Union--History--Revolution, 1917-1921--Campaigns.
World War, 1914-1918--Soviet Union.