Columbia subject headings:
Harvard subject headings:
Communism--History--20th century--Sources.
Communist International--History--Sources.
Communist International. Congress (1st : 1919 : Moscow, Russia)--History--Sources.
Soviet Union--Politics and government--1917-1936--Sources.
Princeton subject headings:
Communism--History--20th century--Sources.
Soviet Union--Politics and government--1917-1936--Sources.