Columbia subject headings:
Communism--History--20th century--Sources.
Germany--Politics and government--1918-1933--Sources.
Soviet Union--Politics and government--1917-1936--Sources.
Trotsky, Leon, 1879-1940.
Harvard subject headings:
Princeton subject headings:
Communism--History--20th century--Sources.
Germany--Politics and government--1918-1933--Sources.
Soviet Union--Politics and government--1917-1936--Sources.
Stalin, Joseph, 1878-1953.
Trotsky, Leon, 1879-1940.