Columbia subject headings:
Mexico--Politics and government--1970-1988.
Partido Socialista Unificado de México.
Socialism--Mexico--Interviews.
Harvard subject headings:
Mexico--Politics and government--1970-1988.
Partido Socialista Unificado de México.
Socialism--Mexico--Interviews.
Princeton subject headings:
Mexico--Politics and government--1970-.
Partido Socialista Unificado de México.