Columbia subject headings:
Mexico--Politics and government--1970-1988.
Political parties--Mexico.
Representative government and representation--Mexico.
Harvard subject headings:
Authoritarianism--Mexico--History--20th century.
Mexico--Politics and government--1970-1988.
Socialism--Mexico--20th century.
Socialism--Mexico--History--20th century.
Princeton subject headings:
Authoritarianism--Mexico--History--20th century.
Mexico--Politics and government--1970-.
Socialism--Mexico--History--20th century.