Columbia subject headings:
Soviet Union--Description and travel.
Soviet Union--Economic conditions--1917-1945.
Soviet Union--Politics and government--1917-1936.
Harvard subject headings:
Soviet Union--Description and travel.
Soviet Union--Economic conditions--1917-1945.
Soviet Union--Politics and government--1917-1936.
Princeton subject headings:
Soviet Union--Description and travel.
Soviet Union--Economic conditions--1917-1945.
Soviet Union--Politics and government--1917-1936.