Columbia subject headings:
Argentina--Politics and government--20th century.
Communism--Argentina--History--20th century.
Socialism--Argentina--History--20th century.
Harvard subject headings:
Argentina--Politics and government--20th century.
Communism--Argentina--History--20th century.
Socialism--Argentina--History--20th century
Princeton subject headings:
Right and left (Political science)
Socialism--Argentina--History--20th century.