Columbia subject headings:
Harvard subject headings:
Soviet Union--History--1925-1953.
World War, 1939-1945--Campaigns--Eastern Front.
World War, 1939-1945--Causes.
World War, 1939-1945--Soviet Union.
Princeton subject headings:
Soviet Union--History--1925-1953.
World War, 1939-1945--Campaigns--Eastern Front.
World War, 1939-1945--Causes.
World War, 1939-1945--Soviet Union.