Columbia subject headings:
Soviet Union--Economic policy--1917-1928.
Soviet Union--Politics and government--1917-1936.
Soviet Union. Narodnyĭ komissariat puteĭ soobshchenii︠a︡.
Harvard subject headings:
Soviet Union--History--Revolution, 1917-1921--Transportation.
Soviet Union. Narodnyĭ komissariat puteĭ soobshchenii︠a︡--History.
Princeton subject headings:
Soviet Union--Economic policy--1917-1928.
Soviet Union--Politics and government--1917-1936.
Soviet Union. Narodnyĭ komissariat puteĭ soobshchenii︠a︡