Columbia subject headings:
Communist revisionism--Soviet Union--History--Sources.
Kommunisticheskai͡a partii͡a Sovetskogo Soi͡uza--History--Sources.
Soviet Union--Politics and government--1917-1936--Sources.
Trotsky, Leon, 1879-1940--Archives.
Harvard subject headings:
Princeton subject headings:
Soviet Union--History--1917-1936--Sources.
Soviet Union--Politics and government--1917-1936--Sources.
Trotsky, Leon, 1879-1940--Archives.