Columbia subject headings:
Germany--Foreign relations--Soviet Union.
Soviet Union--Foreign relations--Germany.
Soviet Union--History--Revolution, 1917-1921.
World War, 1914-1918--Campaigns--Europe, Eastern.
World War, 1914-1918--Territorial questions--Europe, Eastern.
Harvard subject headings:
Germany--Foreign relations--Soviet Union
Soviet Union--Foreign relations--Germany
Soviet Union--History--Revolution, 1917-1921
World War, 1914-1918--Campaigns--Europe, Eastern
World War, 1914-1918--Territorial questions--Europe, Eastern.
Princeton subject headings:
Soviet Union--History--Revolution, 1917-1921--Participation, German.
World War, 1914-1918--Campaigns--Eastern Front.
World War, 1914-1918--Campaigns--Soviet Union.
World War, 1914-1918--Soviet Union.