Columbia subject headings:
Soviet Union--History--1917-1936--Sources.
Soviet Union--History--Sources.
Soviet Union--Politics and government--1917-1936--Sources.
Soviet Union--Politics and government--1936-1953--Sources.
Harvard subject headings:
Soviet Union--History--1917-1936--Sources.
Soviet Union--History--Sources.
Soviet Union--Politics and government--1917-1936--Sources.
Soviet Union--Politics and government--1936-1953--Sources.
Princeton subject headings:
Soviet Union--History--1917-1936--Sources.
Soviet Union--History--Sources.
Soviet Union--Politics and government--1917-1936--Sources.
Soviet Union--Politics and government--1936-1953--Sources.